PDF malware analysis — malicious · a5d27131854c4b80

MALICIOUS

PDF

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

MD5: 83d2aaf5fdf1260b9834187130371ec2 SHA-1: 854fae9846a0965fe2950580daa971f73470840e SHA-256: a5d27131854c4b80225fcc2e317c6a553c401c32b232fd394b9ad5846f2898e1

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_EVAL. The JavaScript stream, identified as javascript_obj0013_001.js, exhibits obfuscation and uses String.fromCharCode, suggesting it's designed to download and execute a secondary payload. The presence of eval() further supports the dynamic execution of potentially malicious code. Due to the obfuscation, the exact nature of the payload cannot be determined, but the overall pattern points to a downloader or dropper.

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` `a8c1cc0df275a72d4d6e4e430dbdb63f5c1fd972af7adf11ab09371621b92c19`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D2	12523 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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