Malicious PDF — malware analysis report

Static analysis result for SHA-256 c784791c7cb24e5e…

MALICIOUS

PDF

35.5 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)
MD5: 6a1eae20996658ee0ec43d42da800958 SHA-1: 3a6a246b514fa1637f61d98b788333bc91b00aa6 SHA-256: c784791c7cb24e5e2d45fe85544c27e84de14506760317b2bb6faa40e8500614
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_UNESCAPE, along with the ClamAV detection as 'Pdf.Dropper.Agent-7302255-0', strongly suggests that the JavaScript is used to deobfuscate and execute malicious code. The primary function appears to be downloading and executing a second-stage payload, consistent with a dropper's behavior.

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-7302255-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7302255-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
98f8f15239aa67bd787a2a2f28e3141e7bb996eb411d8946363c4752c41e3618		 pdf-javascript-stream PDF /JS object 7 at offset 0x215 35126 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0007_001.js
2d779cebe5f7d40f6e0cb382966ad4bf57f67ffacd335c40e5f5f75d2806695c		 pdf-javascript-stream PDF /JS object 7 at offset 0x215 35039 bytes

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