PDF malware analysis — malicious · deb33f071259e429

MALICIOUS

PDF

12.1 KB Created: 2010-12-29 23:33:04 +03:00 Authoring application: qAQP_u (via bccefcc1b1)

MD5: b740c3a0fe2bdf28210a219c96b21e94 SHA-1: f1942b0de1ffbb4b1cf57ed196fc3e2334d4792b SHA-256: deb33f071259e4299ae4cc37b4666ac54aee9d3d598d09ee3fd6911c036b412b

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence PDF_EVAL heuristic firing suggests the use of eval(), a common technique for obfuscating malicious JavaScript. The ML classifier also strongly flagged this PDF as malicious. The JavaScript likely downloads and executes a second-stage payload, as suggested by the presence of obfuscated script streams.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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` `1ed34d73fdd24b95756edda50d810ebadddfcaabd1de44b88b677996aaae857b`	pdf-javascript-stream	PDF /JS object 11 at offset 0x243E	2360 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `10d204f137f478984a9b3f3668089211fa814bede4961d07f2f5b393ae3923a4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2887	1071 bytes
`javascript_obj0015_002.js` `397670edd492681202f5dc7722f5da7706107ad64efd2b2512eb02217854d530`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2AF4	314 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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