Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c3a9a28b1958a1…

MALICIOUS

PDF

18.8 KB
MD5: 9c714ccc1b74aec7787a29bd0bac64b9 SHA-1: b91978099c1ed7abab566b6207ab66c48734bf1c SHA-256: 01c3a9a28b1958a1b05d0890ef63c44a6bba92f878e6317d8f531a4005ba74d9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating it contains an exploit. It also contains embedded script content, suggesting it attempts to execute a payload, likely by leveraging an embedded file. The benign URLs present do not detract from the malicious indicators.

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
1621357ff2084c46383f6ed08459c43b70cf3b53466b57465f356f549f562b87		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18508 bytes

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