PDF malware analysis — malicious · d552651ab78a07fd

MALICIOUS

PDF

6.7 KB Created: 2009-11-17 23:22:12 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 2124efa22c4a2bb76b1569cd8a4da33d SHA-1: 6f5566da5fece68ce51103079aeb1c9bb14cf4d1 SHA-256: d552651ab78a07fd4556746c40602c273635c59d3978fa9d2d465c5ce8515f87

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The JavaScript stream, named 'javascript_obj0016_001.js', is obfuscated using 'unescape()' and 'String.fromCharCode()'. This obfuscation suggests the script is designed to hide its malicious intent, likely to download and execute a second-stage payload. The presence of these indicators points to a common PDF-based malware delivery technique.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0016_001.js` `7cb294f3f9f3a8e4ffbde61785d9270f886e03fd7150231e62102a80fd73bebe`	pdf-javascript-stream	PDF /JS object 16 at offset 0xC9A	12549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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