PDF malware analysis — malicious · a5c85d03d524bf1e

MALICIOUS

PDF

4.2 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 87895192e249503ad9863c7b6d4ade0e SHA-1: 0ce763ea3a084b9f775908c64f9eb86cbd262a38 SHA-256: a5c85d03d524bf1e33f71f666c2ba7e04f90500576c8bd123c23502ef342b005

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The script is obfuscated and utilizes eval() and String.fromCharCode() functions, suggesting an attempt to hide malicious functionality. This script is likely responsible for downloading and executing a second-stage payload. The high confidence in the eval() call and the presence of an extracted JavaScript file point towards a malicious intent, though the specific family cannot be determined.

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_obj0013_001.js` `446cf567a2ee751e0442bb9d3c43d904f808312e608cd96dc84a2e631d2bd13c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D2	12717 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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