PDF malware analysis — malicious · 318830187bf0c57f

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 8e75f174c510a27b318e5e2f0f2e8ab8 SHA-1: 7cdc46ffbc3a5b3ed8018d5e9998dbc375500e72 SHA-256: 318830187bf0c57f6873d2a5ffbdec91d1e2602d1af231366abdbd6db6933a8e

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 JavaScript stream, named 'javascript_obj0001_000.js', is obfuscated and uses String.fromCharCode and eval(), suggesting it's designed to execute arbitrary code. The primary intent appears to be downloading and executing a secondary payload, a common technique for initial access.

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_obj0001_000.js` `2b2580c30e0e975ee1f90ea103232b84472982ce9218f369aeb595d57c8fb01a`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	965 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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