PDF malware analysis — malicious · f9fcdee4642eb91c

MALICIOUS

PDF

7.5 KB

MD5: 2779e44f0793233669b3501819a8a0ed SHA-1: 6bccf110ed5979b8ea995b841405c0852ac1c0e7 SHA-256: f9fcdee4642eb91cddc4bddf9b83b3d10438fda39fff63279a062336b410e7ac

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded and obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests malicious intent. The unescape() function call further points to obfuscation techniques used to hide malicious code. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the ML_NYX_PDF_MALICIOUS heuristic and the presence of an extracted JavaScript file.

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_obj0009_000.js` `26ff536c70d0bcc0e41bdb1205ec1387cd39d9c7ab0fbd470f2295d98f895c91`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	6175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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