PDF malware analysis — malicious · c4a26386c2bf8c4a

MALICIOUS

PDF

5.5 KB Created: 2009-10-05 22:59:14 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 6c4859a9ffd8355ab98a54d7ab6a53cc SHA-1: 68f986dbabc8fe4433bc8cb69c9574bbd0fb8283 SHA-256: c4a26386c2bf8c4ac6868408fe05258c711af0e2dbfc9e314297d3d49bca8ed6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, identified as 'javascript_obj0016_001.js', appears to be obfuscated, as suggested by the PDF_UNESCAPE and PDF_FROMCHARCODE rules. This script is likely responsible for downloading and executing a second-stage payload. The presence of JavaScript actions and streams within a PDF is a common technique for delivering malware.

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` `81cd744668e109efe99547076e4427bb5b261fe9c760b0c2ceecf37e5ee16523`	pdf-javascript-stream	PDF /JS object 16 at offset 0x75B	11867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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