PDF malware analysis — malicious · 422c249d8984d561

MALICIOUS

PDF

8.0 KB Created: 2009-09-14 19:47:23 Authoring application: Eblasha 10.8.5.3 (via PDF Library 8.9.3.1)

MD5: 4217dc50c3c532f53c923ef1448ca732 SHA-1: e7d421134aa03731b8175c0cbd4474dbb73083d3 SHA-256: 422c249d8984d5614f437953b182a621ef840edca5856eea01637bf39a5f34df

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was detected as malicious by ClamAV with the signature Pdf.Dropper.Agent-7254600-0. Static analysis revealed embedded JavaScript with multiple obfuscation techniques, including the use of eval() and String.fromCharCode(). This script is designed to download and execute a second-stage payload. The presence of these indicators suggests a dropper functionality.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7254600-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7254600-0
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` `1939112374b1d255a6acc22710f71c242f55468789b90c2bb593385fc1979892`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21275 bytes
`javascript_obj0015_001.js` `9a3f1dbacce708826256c1516e218e2fdd1cfeb17965d2a2950cc7d591001537`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1BD7	220 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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