Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c600a0a1ccf1ed…

MALICIOUS

PDF

12.0 KB
MD5: c0c0a6e8244ce4a52438ebe9d6433e7e SHA-1: b72d266ca3189a82dff0120ab6b2ce73c8b0c24b SHA-256: f6c600a0a1ccf1edd5eab023b269ba2caaef0e87b6833ee9c272838a1c0975a4
128 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate the use of PDF filters with exploit indicators and an embedded file, suggesting it's a dropper. The PDF structure itself does not contain user-readable content, further supporting its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
3d3b5ae591095710bcd7555671d852592b874c8d027484969e7dfb6847a9405b
pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1874 bytes