PDF malware analysis — malicious · da6b3f8f307e35b4

MALICIOUS

PDF

12.0 KB Created: 2010-12-17 23:37:30 +03:00 Authoring application: g_oZTHq (via bdd88)

MD5: b0136ffa06ad88ff4c4a59b4c550f74a SHA-1: 68e10ff038759c274c5d9e7eb9dd315c1fea386e SHA-256: da6b3f8f307e35b4f42d8a0607b666b509719bd010e92d7398b4dee5715ff257

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple JavaScript streams, with high-confidence heuristics indicating the use of eval() and String.fromCharCode for obfuscation. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial access and further infection. No specific family could be identified due to the generic nature of the exploit and obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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. (matched inside decoded stream)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `037d8e2b06a06dd3ffdde3cb807f3a6ac630238070d4d3d5a608ec613ab2c0d1`	pdf-javascript-stream	PDF /JS object 11 at offset 0x23D3	2312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `22a65ff3d563b72c3f4c2f73b82ccbc128a456b2a8e15f34a90d3baa0b763961`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2803	1104 bytes
`javascript_obj0015_002.js` `25a90b85cd058ee93473ccb3d4e9444dbeba7e07dc340cefc1da38a34fc2c2c6`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2A77	307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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