PDF malware analysis — malicious · 857d2ac1d8e89ece

MALICIOUS

PDF

10.3 KB

MD5: 19be1348523f0a16ed121ae6235ebf4f SHA-1: 67c66de8dda1453e4404430bb28b4db02d99ef37 SHA-256: 857d2ac1d8e89ece7bc7a206293956c344141e8290a0aaa19f1c24755c629c60

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The JavaScript stream is obfuscated, as evidenced by the PDF_UNESCAPE firing and the 'Script obfuscation indicators' signal. The primary function of the script appears to be downloading and executing a secondary payload, though the exact URL or execution method is obscured. The presence of obfuscated JavaScript points to a downloader or dropper functionality.

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` `9b2f77cb11a7c846d80b3aa57e4bf72eea586670d6cfc749421f7e24520d04c8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46211 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 222 eval/decoder/string-building token(s).

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