PDF malware analysis — malicious · 2e5571dca92ba5bf

MALICIOUS

PDF

7.0 KB Created: 2009-09-15 19:44:38 Authoring application: Eblasha 7.6.6.6 (via PDF Library 8.9.9.8)

MD5: e5c69e5a06c39d4fe375ffbae676d1c0 SHA-1: 1d6fdecace2c45cbd29e31964f7ae60d16d277ff SHA-256: 2e5571dca92ba5bf1ffe98de6523d4c060cca3ab298f10053213457eaabdccc3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF was flagged by ML classifiers and ClamAV as malicious (Pdf.Dropper.Agent-7244635-0). Analysis revealed embedded JavaScript streams, including one that utilizes `eval()` and `String.fromCharCode()`, indicating obfuscated code execution. This JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7244635-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7244635-0
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` `8d477f9c9cbfbbfc83cf6803ccf3ba2cc7a4d43195be1ad8ad8ea0e6370b52ce`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21191 bytes
`javascript_obj0015_001.js` `a91743f96b25b230bf1d1bf48451137c02abdd9f4a632888537e9641dd8dba0c`	pdf-javascript-stream	PDF /JS object 15 at offset 0x17E5	199 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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