PDF malware analysis — malicious · a79c9ccfc51dd5ba

MALICIOUS

PDF

66.0 KB Created: 2010-03-06 05:18:27 Authoring application: LuyUvDfkF (via QF0o3Onh9)

MD5: 9bc301a1c19a9cede1e4cc9306f8f554 SHA-1: 730109300c25c25728fad0c3bcd9c35e921f881a SHA-256: a79c9ccfc51dd5ba8d9998f842c1a1f71379a0795606c43a6d837ce04dd721fb

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The high-severity PDF_EVAL firing suggests the use of eval() to execute obfuscated code. A large JavaScript file (javascript_obj0007_000.js) was extracted, which is likely responsible for downloading and executing a second-stage payload. The obfuscation and use of eval() are common techniques for evading detection.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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.
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.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `2d5c6cdb3dfda69623dda3a408167ca3dfa32fcb4efa448cb76992e9af77feb8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	66312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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