Malicious PDF — malware analysis report

Static analysis result for SHA-256 968847b4816aa617…

MALICIOUS

PDF

18.9 KB
MD5: b85d9ce0dad38484f1685151362a77e0 SHA-1: 57a40df002dbf68b00f5805ac261c4836b4ed8ee SHA-256: 968847b4816aa61721c98c41baef7e5a14bad82236334742779df47884211cfa
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF was flagged as malicious by ClamAV and an ML classifier, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports this. The embedded script likely attempts to download and execute a second-stage payload, which is a common technique for delivering malware via malicious documents.

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
251f647605152d34f35ac0db412a2bd5ebcb84eded9233ca35b417d182bb275e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18546 bytes

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