Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f0cf4f23e489e1…

MALICIOUS

PDF

5.2 KB
MD5: 6c9fcd1ebdefb52f004145dfe029f93e SHA-1: 7dda78e83dfbbc56969e93d7c8ec6948c0c9371e SHA-256: 35f0cf4f23e489e16db75a8ee0ab6dabdd0fa43dceb761044964265c4bd16880
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The use of ASCIIHexDecode and ASCII85Decode filters, along with the PDF_FROMCHARCODE heuristic, suggests obfuscation techniques commonly used to hide malicious code. ClamAV detection as Pdf.Exploit.Agent-36178 further confirms its malicious nature. The lack of readable document body text prevents a more specific determination of the lure, but the presence of exploit-related indicators points to a likely exploit delivery mechanism.

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36178
  • 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
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Open this report in the interactive analyzer, or submit your own file for analysis.