PDF malware analysis — malicious · 8c630f5a6d1e8e98

MALICIOUS

PDF

5.0 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 3a9a972fec3961900f6def089f68082f SHA-1: 6b70e7addcef30fef941afd1f006d4c50f51e40c SHA-256: 8c630f5a6d1e8e98e634390973af47ecd1e0dadf1a989462f1e331e3f61e88a4

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence PDF_EVAL heuristic firing suggests the JavaScript is obfuscated and uses eval() to execute code. The presence of extracted JavaScript files, including one labeled 'deobfuscated-js', further supports this. The script's likely intent is to download and execute a second-stage payload, a common technique for malware delivery.

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_001.js` `1bbf69bb02147ab65c54fde3833fde95d1f9eab2c5274e405c4a4e6b9343cdbb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x366	6690 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `06b9af568abc709082323aec5e6c5dbc23ef33fa74bdd36f02a3f5ed96f5443b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x71F	4340 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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