PDF malware analysis — malicious · bfde820222537dd7

MALICIOUS

PDF

35.4 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)

MD5: 2dc7c71b5728ce07600038a115e39b8c SHA-1: 5d0c172304ac0c711cd81a1d0b96b67395bb558e SHA-256: bfde820222537dd7aa11da9537d0e8086dc9f4251890fae8c87d51730c7f260d

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The presence of `eval()` and `unescape()` calls within the JavaScript suggests code obfuscation and execution. While the exact payload is not directly visible, the structure points to a downloader pattern. 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
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_obj0007_000.js` `14683682a564c54a13306975ab5821639dd08f7076b3b9cb48bbebd43693ba5c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35006 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `c2814d9f31e32cbb0ee743dbce0182554131006a2424f1252499c130495fed01`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	34919 bytes

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