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Peritaje informático de documentos PDF y otros archivos digitales mediante análisis forense

Digital forensic analysis of office documents

Digital documents are commonly used as evidence in legal proceedings. Among the most frequent formats are PDF files and documents created with Word, Excel or PowerPoint. When their provenance, content or possible modification is disputed, forensic analysis makes it possible to examine information that is not always visible when opening the document and to assess its origin, authenticity and integrity.

The examination may include both the visible content and the metadata and internal structure of the file. This information may provide indications regarding its creation, modifications and the software used, but it must be interpreted together with the provenance of the document and the other available evidence, without treating authorship or a particular date as an absolute certainty on its own.

What do we analyse in a digital document forensic examination?

  • Preservation and integrity of the evidence: controlled acquisition and preservation of the files under examination, documenting their provenance and the actions performed in order to maintain traceability and verify that they remain unchanged throughout the analysis.
  • Forensic analysis of PDF documents: examination of their internal structure, metadata, objects and embedded content, digital signatures and, where present, revisions or updates incorporated into the file that may provide relevant information about its generation or possible modifications.
  • Document metadata: analysis of recorded dates, author or user information, software used to create or modify the file and other available information, assessing its consistency and limitations in relation to the remaining evidence.
  • Word, Excel and PowerPoint documents: examination of the file structure and its internal components in order to identify relevant information, such as comments, revisions, hidden sheets, macros, embedded objects or other elements that are not always visible when the document is opened.
  • Origin, authenticity and integrity: joint assessment of the file, its metadata, structure and other available evidence in order to determine its provenance and whether or not technical indications of manipulation are observed, always limiting the conclusions to the scope of the evidence examined.
  • Comparison of documents and versions: comparison of different copies or versions of the same document in order to identify changes in their content, metadata, structure or other relevant elements.
  • Counter-examination of digital documents: review of the files and reports submitted by the opposing party in order to determine whether their conclusions are supported by the evidence examined and by the methodology applied.
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Do not put the judicial assessment of your digital evidence at risk Require an official university degree in Computer Engineering

Spanish Law 12/1986 of 1 April recognises the full professional powers and responsibilities of technical engineers within their respective fields of specialisation and expressly includes the preparation of expert assessments, studies and reports .
In the field of information technology, the Resolution of 31 March 2026 of the General Secretariat for Universities expressly includes, among the competences associated with official university qualifications leading to the profession of Technical Engineer in Information Technology, the knowledge required to carry out measurements, calculations, valuations, appraisals, expert assessments, studies and information technology reports .
Entrusting a digital forensic examination to a person who cannot provide evidence of an official university degree in Computer Engineering may seriously compromise the defence of the case. The opposing party may challenge the expert’s qualifications, the methodology applied and the technical reliability of the conclusions, weakening the evidential value of the expert report and placing at risk digital evidence that may prove decisive in the proceedings.
Given the risk of unqualified professional practice in this field, before commissioning a digital forensic examination, make sure that the professional holds an official university degree in Computer Engineering , has proven experience, is professionally registered and possesses specific knowledge of the subject matter under examination.
Qualifications, experience, registration with officially recognised professional bodies, rather than mere membership of private associations , the methodology applied, the proper preservation of the chain of custody and respect for fundamental rights are essential elements in providing the court with an expert report that is technically rigorous, reliable and defensible before the court .
In our Frequently Asked Questions section, we explain how to verify the official qualifications, professional registration and legal authorisation of a digital forensic expert witness.

Why hire a digital forensic expert from FORENSICTECH ?

At FORENSICTECH , we provide every client with a team of qualified digital forensic experts under the direction of Hossaín Mimón, a registered digital forensic expert witness . Our objective is to provide the proceedings with digital evidence that is technically sound, traceable and understandable to lawyers, judges and courts.
By engaging our services, you benefit from:
  • Digital forensic experts holding an official university degree in Computer Engineering, registered with officially recognised professional bodies and legally authorised to prepare and defend expert reports before the Spanish courts.
  • Experience and specialisation in digital forensics and digital evidence , with each analysis adapted to the specific circumstances and requirements of the proceedings.
  • Forensic tools and specialised software for carrying out rigorous, verifiable and technically reliable analyses.
  • Professional methodology and proper preservation of the chain of custody , essential for maintaining the integrity, traceability and reliability of digital evidence.
  • Clear, well-founded and comprehensible expert reports , with an orderly presentation of the methodology applied, the results obtained and the conclusions reached.
  • The option of professional body certification of the expert report , where appropriate or requested by the client, as verification of the expert’s identity and professional authorisation and of the correct formal presentation of the document.
  • Court testimony and technical assistance at trial , with the ability to explain and defend the conclusions of the expert report before the court.
  • Services throughout Spain , with availability to participate in legal proceedings anywhere in the country.
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