PDF malware analysis — malicious · cad221d7d5d24213

MALICIOUS

PDF

7.1 KB Created: 2009-09-11 19:44:44 Authoring application: Eblasha 4.9.8.9 (via PDF Library 1.10.2.8)

MD5: 9abb7ff30ccd82b087b476c8e19ca8c0 SHA-1: 7278a027feac02a61611efab886048fc7695aae0 SHA-256: cad221d7d5d24213ced50ebe8a9d19e5eb3910caaedaaef5b9244291bb9d4229

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF sample was flagged as malicious by ClamAV and a machine learning classifier. Heuristics indicate the presence of embedded JavaScript with eval() calls and fromCharCode, suggesting obfuscated code execution. The ML classifier's high confidence and the ClamAV detection strongly suggest this is a dropper. No document body text was available for analysis, but the presence of JavaScript points to an attack pattern involving the execution of arbitrary code, likely to download and run a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7304029-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7304029-0
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` `5532bc786791bdad12c06c31be970e0c8a17cc5187e232c0a3100c03b9a98bd5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21220 bytes
`javascript_obj0015_001.js` `51ce5f4cd48bf2115c1a38904bb2b7f8113dcce04fd5aef58f7481b1dd181d6e`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1842	175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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