PDF malware analysis — malicious · c94d580d66559f88

MALICIOUS

PDF

7.0 KB Created: 2009-09-21 19:47:01 Authoring application: Eblasha 8.2.10.3 (via PDF Library 10.10.7.1)

MD5: bcec35292969d7fd6253dd4a67cd3297 SHA-1: 9b1c50f003891482d38489a861fa8dc26dfccee9 SHA-256: c94d580d66559f88f253780891a4d22dd7a5fff3094718f168ad034302bc1e28

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged by ClamAV as 'Pdf.Dropper.Agent-7303203-0' and contains embedded JavaScript. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscation. The primary function of the embedded JavaScript appears to be downloading and executing a secondary payload, as indicated by the ML classifier and the presence of JavaScript streams. The obfuscation and dropper behavior point to a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7303203-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7303203-0
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` `0008876a02b9ba648c5f909a8dd112eee54125d3997d0c7f4ededebe49d8377f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21166 bytes
`javascript_obj0015_001.js` `e0be56e57011123fd9f7a018ed8c14332472fe2b4899d767ff451dd498343f1b`	pdf-javascript-stream	PDF /JS object 15 at offset 0x17F1	208 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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