Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb91568776d03183…

MALICIOUS

PDF

2.6 KB
MD5: a768294a7bd292aa1ae8a0662fae59fc SHA-1: e15bbec906ae8fd66d83e3276e3a628f15d8eb35 SHA-256: cb91568776d03183c71401025ed387964578193c994b3b65312f9a48684f661f
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE' heuristics. The 'ClamAV: Heuristics.PDF.ObfuscatedNameObject' rule and the presence of an extracted JavaScript file ('javascript_obj0006_000.js') further confirm its malicious nature. The JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured. The confidence is slightly reduced due to the obfuscation preventing a definitive analysis of the script's specific actions.

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
ba472d98c88d925f82a79845c77b4d4955da316b7135d4421589057552922b00		 pdf-javascript-stream PDF /JS object 6 at offset 0x1B6 1477 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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