PDF malware analysis — malicious · c530047be5d32b9b

MALICIOUS

PDF

3.2 KB Created: 2008-08-07 19:47:57 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 1e095343576b2dac027eb0eaf1839f1c SHA-1: b9b6d5421197e95a37f27e5495c22593c4a42124 SHA-256: c530047be5d32b9b52a2339445ccfe62fd80cfcc7d550252c2efd973802f5191

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript, including an eval() call and String.fromCharCode usage, indicating obfuscated code execution. The presence of deobfuscated JavaScript further suggests the intent to download and execute a secondary payload. The specific JavaScript content could not be fully analyzed due to obfuscation, but the overall pattern points to a malicious downloader.

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` `2dc3d97c9d9b7620fe2b31eb32272fcd59ca4793ce7843e2a4a00ac3f02706f8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5480 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` `9cf8accab9107f72899aa6db85827958c803a6f213ea9b51f5e6974cd46a2890`	deobfuscated-js	PDF JavaScript deobfuscation pass	12741 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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