PDF malware analysis — malicious · 795cc581b9f7f5b3

MALICIOUS

PDF

27.3 KB Created: 2010-03-17 00:18:51 Authoring application: qyqX3lu (via IeUSvcQ9vH2y)

MD5: ae35edf48aff9666fc9195e59f79c255 SHA-1: 6e7fb4a57a9ee70370b4e6dcec5babbe73d0813d SHA-256: 795cc581b9f7f5b3469f0ffba2fc88fcd75eaa12a6c5016d78ca97ac6d4bd3e4

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing `eval()` and `String.fromCharCode` (PDF_EVAL, PDF_FROMCHARCODE), which are common techniques to hide malicious code. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the heuristic 'Suspicious extracted artifact — Signals: Script obfuscation indicators; files: javascript_obj0007_000.js'. No specific malware family could be confidently identified due to the obfuscation.

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` `c67719747629aa6d6479610c52520dcd3ebd051da7628b5635af01aa9e72ba32`	pdf-javascript-stream	PDF /JS object 7 at offset 0x243	26729 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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