PDF malware analysis — malicious · b7d8923122759135

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00

MD5: e60003034163ea47ea2c0edf81fc2e64 SHA-1: ab78570a54f1491b59d319a3d23c855d78e29d71 SHA-256: b7d8923122759135bb978764e1b2f65019310da7ebf3599e223e97610c77f700

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Exploitation for User Execution

The PDF file contains embedded JavaScript, flagged by multiple heuristics including a high-severity eval() call. The ML classifier strongly indicates maliciousness. The embedded JavaScript, named 'javascript_obj0001_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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_obj0001_000.js` `cdb5f950210c57875c4932845bda67b3f5a581178e918f265194b4e37772e57f`	pdf-javascript-stream	PDF /JS object 1 at offset 0x64C4	928 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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