Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b7ae105ae7dd8f…

MALICIOUS

PDF

25.9 KB
MD5: 290c387ae2febbf544d6bb57e5b9aa36 SHA-1: 3e78fb46614a779dfd95532560595cdbd3908b72 SHA-256: f8b7ae105ae7dd8fe52c3c63e1b5a5b892b6793c8be1c62c872dd428846d3dbe
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The file is identified as malicious by multiple engines, including ClamAV and an ML classifier, with a critical heuristic firing for embedded script payload. The PDF structure also indicates the presence of an embedded file and XFA forms, common in exploit delivery. While no specific script content was readable, the overall indicators point to a malicious PDF designed to exploit vulnerabilities and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
cd10638d1d1ae41c17b3f1e2d08472fc85bf168ecb36f8bbf59deafe468c4e1b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 25769 bytes

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