PDF malware analysis — malicious · 86eec34fa30e04ec

MALICIOUS

PDF

11.4 KB Created: 2010-10-06 16:18:09 +04:00 Authoring application: b_cJ__nm (via a8ed711)

MD5: de67dc6647d665eac01c0b81ccc4ecfd SHA-1: e63f1321a314e5bae280ba6c9aa8201b09932623 SHA-256: 86eec34fa30e04eceaef9cd5014e4149fe67a95406f94a5616925bca0a469b23

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The JavaScript is obfuscated and uses String.fromCharCode, suggesting it's designed to download and execute a secondary payload. No specific family could be identified due to the 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` `2040e342c6b36431a4f94bd633008c57c1e8256fcd31c189d07d9904d4cb9042`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2451	1074 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `6f2764c24a0e4fd78abd2074c9f58b3b5c2c3937181f1c8e9b6982ec0b95cf31`	pdf-javascript-stream	PDF /JS object 13 at offset 0x26D6	535 bytes
`javascript_obj0015_002.js` `a87b2eea8914a7d52bc275f90ca88e1e51be24d503cffb43873dc43535066eaf`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2875	138 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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