PDF malware analysis — malicious · 8b0c649ac40343dd

MALICIOUS

PDF

15.9 KB Created: 2009-05-04 07:09:04 Authoring application: kiPgXm (via nY8eQ0x)

MD5: c1d43818425b7299379138127c11d44d SHA-1: c983f99e36e77a2fa83b0be8abe0b679ebbf1bc2 SHA-256: 8b0c649ac40343dda9b488b66285c058e32aefe3e191bdcfe632d131888ca01d

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. This obfuscated script is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly indicates maliciousness. Due to the obfuscation, the exact nature of the payload and its ultimate destination cannot be determined from static analysis alone.

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `507d5df726c227905d13a5f69a3caa3e0789eb15903268f2dc2a02c7efb28315`	pdf-javascript-stream	PDF /JS object 7 at offset 0x246	15027 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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