PDF malware analysis — malicious · 8f21d5caaa6dfb64

MALICIOUS

PDF

10.1 KB

MD5: 162fef7fb60330244fe1a4cacd9bf590 SHA-1: bea7f7761b91222e0ce1db0aeacaf62997a44508 SHA-256: 8f21d5caaa6dfb64d8bde63d36f58a25a85b64fabc945c16a4cbfef4e1cddd2c

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as 'javascript_obj0007_000.js', appears to be obfuscated, as suggested by the 'Script obfuscation indicators' heuristic. This obfuscated script is likely responsible for downloading and executing a secondary payload, a common technique for initial access and further system compromise. The presence of unescape() further supports the obfuscation and dynamic content loading.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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` `2bddda20fa2711239f4a303ee0f1fc2c6b4f052153ac93abb4bd9a501d209912`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46358 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 223 eval/decoder/string-building token(s).

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