PDF malware analysis — malicious · a5b84685e6faffa8

MALICIOUS

PDF

11.3 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: 43857c805faa90f04bb6300575ed9a59 SHA-1: 15d78c255a9098e0518df18d4881002bf85aef6b SHA-256: a5b84685e6faffa830154461634c76b771da040791161fe39c38be50065e3dfa

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical ClamAV detection as 'Pdf.Exploit.Agent-35541' strongly suggests a known exploit. The embedded JavaScript stream, identified as 'javascript_obj0027_000.js', is likely responsible for executing the exploit, which in turn probably downloads and executes a second-stage payload. The lack of specific IOCs beyond the ClamAV signature and the obfuscated nature of the JavaScript prevent a more detailed analysis of the payload or delivery mechanism.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35541 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35541
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0027_000.js` `4df3bb16eecf5992f73e154d003d0137035f1af9ff555d5dbf7bd9eed7ac9e8f`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	25996 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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