PDF malware analysis — malicious · 9495f3f5907ab4eb

MALICIOUS

PDF

6.6 KB Created: 2010-12-26 19:13:09 Authoring application: inn ink

MD5: 32fd8bada934bd3034d43e84458d6b44 SHA-1: fbbfe8e6c09fd9dabaa6d178fb032a3b311240e5 SHA-256: 9495f3f5907ab4eb9b6469f5822f9790fbf7ed736b451b8f5331d45ea5fbf83c

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, flagged by multiple heuristics, including a high-severity ML classifier. The JavaScript utilizes an unescape() function, a common technique for obfuscating malicious code. The ML classifier's high confidence score and the presence of JavaScript streams strongly suggest an exploit attempt. The script's obfuscated nature and the use of unescape() indicate it's designed to download and execute a secondary payload, though the exact mechanism is obscured. The document body text is largely unreadable due to encoding issues, providing no further context on the lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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_obj0003_000.js` `5fd374a270aff874a450bf059e746361d77aa80299872f6a5b1328e0847494c3`	pdf-javascript-stream	PDF /JS object 3 at offset 0x913	3985 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0003_001.js` `475616a3744c5a909ea0f265c30781bb54b12a3a8005b1f1eb9363eaffbb6121`	pdf-javascript-stream	PDF /JS object 3 at offset 0x935	4363 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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