PDF malware analysis — malicious · af841a171c13edd9

MALICIOUS

PDF

7.9 KB Created: 2009-09-11 19:47:62 Authoring application: Eblasha 4.8.4.2 (via PDF Library 6.3.6.3)

MD5: 08cd191d5c0b74575fb53d10b0fced40 SHA-1: cc903a44418100ba386c9f874bc1f97cb53d1ed2 SHA-256: af841a171c13edd9de5ce8989aef1d086e4019478e6680802a52d03bb0dfed5d

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating obfuscated code execution. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript streams, particularly 'javascript_obj0015_001.js', suggests the document is designed to exploit PDF vulnerabilities to run malicious scripts, likely for downloading and executing further stages of an attack.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `f9e507b338d90d3d4e785cb320ff35a6211b8ca3430d141b993728fad94a1579`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21172 bytes
`javascript_obj0015_001.js` `d3c75bd2aea058a4c9445a416d85af297a21eb2e79d3775b3cea03c20a4609cb`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B67	193 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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