PDF malware analysis — malicious · fa0d9800032bfebf

MALICIOUS

PDF

7.9 KB Created: 2009-09-25 19:43:61 Authoring application: Eblasha 3.8.2.4 (via PDF Library 1.6.7.7)

MD5: 64320df27c9ead2daa5b1192a3c42730 SHA-1: f4f52fcd1b300839a395a1fb989e83aafe8826d4 SHA-256: fa0d9800032bfebf29e701ed7012d036b33a3d78570ef1231403b0d5e2a28cfb

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests obfuscated code designed to execute malicious actions. ClamAV detection as 'Pdf.Dropper.Agent-7326702-0' further confirms its malicious nature, likely acting as a dropper for further stages.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7326702-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7326702-0
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` `ae8e9e62bb6bba491a351ce79b51d4618061c56f7cb93830639cd53b7d181bd7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21126 bytes
`javascript_obj0015_001.js` `8220510139017ce16d0f1a09136911ad3e7f0dc0d032d6bf773a6b1b919ab5cb`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B5F	196 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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