PDF malware analysis — malicious · 1bb622073aff4b93

MALICIOUS

PDF

3.1 KB Created: 2009-05-31 15:33:12 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: d47ca576822943d6a3d1f87b992a6614 SHA-1: 4737feb7613b107d3fd293afaec6bc73026fd449 SHA-256: 1bb622073aff4b9327519d3ac7f8d575e54cae30e3d95a0aba8fbd017a526c6f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode(). The ML classifier strongly indicates maliciousness. The deobfuscated JavaScript likely downloads and executes a second-stage payload, a common technique for initial access. The presence of multiple JavaScript-related heuristics and the ML score contribute to the confidence in this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `956fb672b2bf2923bd6d490024111bf9d188e28d2039d40987da415eaf4d9a2c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	4830 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `d502b4f5af568d7f45fae1837a816177492e44b53af6d069cb55cc55510bb374`	deobfuscated-js	PDF JavaScript deobfuscation pass	10679 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.