PDF malware analysis — malicious · 39aca1f4489941af

MALICIOUS

PDF

4.3 KB Created: 2008-12-17 23:30:58 UTC

MD5: 13a04b40bce9e44b460b329e8ab0f6f4 SHA-1: 231ef4a073a715ffb4930155b3e4eb652ed0ee17 SHA-256: 39aca1f4489941af8b0e7d332a147ee445bcb8d77eebdebb6b742f4aeb7bd6f1

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is heavily obfuscated and uses eval() and String.fromCharCode(). This script is designed to download and execute a second-stage payload. The heuristics indicate a suspicious extracted artifact, specifically a JavaScript file with obfuscation indicators. The primary IOC is the embedded JavaScript file itself, which is the likely vector for the malicious activity.

Heuristics 5

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_obj0006_000.js` `c14bd3ac81e5be7cfcc8f18769708a8a9e67c30b763330c171aa7645009a8d65`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	30713 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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