PDF malware analysis — malicious · 8d46189b7058a89d

MALICIOUS

PDF

3.2 KB Created: 2008-09-02 15:33:42 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 1cf455dfada693f7d7ae14d6b30fa9b7 SHA-1: 9f9681c78536e0c0d482cdb8be93b908c0a79329 SHA-256: 8d46189b7058a89df470110cf82639f16d5f9b813b3e603bb3dee3f12f31fdb9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier also flagged it with high confidence. The JavaScript likely attempts to download and execute a second-stage payload, as suggested by the 'eval()' call and 'String.fromCharCode()' usage, which are common techniques for obfuscation and dynamic code execution in malicious PDFs. No specific family could be identified.

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` `ae454536cf573e0b23e913c992d23c1853a29de3dc7a847cc9dc59a1b7b94ac1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5507 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` `df531d00b15df0e18a1a6deef10835b9297e58edc0eef453a83fb825a220b016`	deobfuscated-js	PDF JavaScript deobfuscation pass	12099 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).

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