PDF malware analysis — malicious · 2bd4b14a50a5cf76

MALICIOUS

PDF

6.4 KB Created: 2009-10-25 20:35:22 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 7f1990180a35e86eef61400c65cf4ce7 SHA-1: 5cba212c0f373a5b3edcaeefc3261c060b7f9985 SHA-256: 2bd4b14a50a5cf769b2ee6ae51b7d1e93eb5c7748b8f00440c17bf96a79f24f9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, named 'javascript_obj0013_001.js', appears to be obfuscated, as suggested by the 'Script obfuscation indicators' heuristic. The presence of unescape() and String.fromCharCode calls further points to obfuscation techniques commonly used to hide malicious code. This script is likely responsible for downloading and executing a second-stage payload.

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_obj0013_001.js` `ca4205de3a101decd1e3eebbe75c9c0f05d4d8bddb4360369bb89ee18fe26dcf`	pdf-javascript-stream	PDF /JS object 13 at offset 0xC11	10804 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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