PDF malware analysis — malicious · 2e5e20385f80b775

MALICIOUS

PDF

8.0 KB Created: 2009-09-13 19:49:03 Authoring application: Eblasha 6.3.6.4 (via PDF Library 5.5.8.1)

MD5: a4e4e0ab57366ce58bfc17f65b2202bf SHA-1: 93f4a9fc1b783a3018fefbdce6dabfeb2de77578 SHA-256: 2e5e20385f80b775e0930d0dedbe1fb6706a22da52fb61a20b16993cacef12a0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious (Pdf.Dropper.Agent-1828680). It contains obfuscated JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of a downloader attempting to execute a second-stage payload. The presence of JavaScript actions and embedded JS streams further supports this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-1828680 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828680
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` `701b4536ac04c57680552f1ed15ddad0025efa63f5254f723ad4d0f3a630a2f5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21322 bytes
`javascript_obj0015_001.js` `58ebbbb39a7fbfe2b87445500dd6c643fa38f76b5b1098d01cd72d98db17e04a`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1BE6	190 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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