PDF malware analysis — malicious · b2a397066509de14

MALICIOUS

PDF

30.8 KB Created: 2009-05-01 21:21:45 Authoring application: ghjkSFghjkCPx (via afdsdgf)

MD5: e8344ea110ada21f6de1d2685a64e422 SHA-1: d9c02ef7b6dac76b0b867b7b727d4da36e85160d SHA-256: b2a397066509de14858982b0d919722a1a30eb2be5404bbecae74e2deda76a35

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() for obfuscated code execution. The script appears to reconstruct strings and execute them, likely to download and run a second-stage payload. The ML classifier strongly indicates maliciousness. No specific family could be identified due to the heavy obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `cf1d67a5505bc0a3657a73c65e6f9540e297693c8cd50296166269e020df9e4c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	30348 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `b5bd64516de85af1fdd49f5279eba8dc7d654478cc07da303e06b67bf351f141`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29351 bytes

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