PDF malware analysis — malicious · 4a6b43ca908c32e5

MALICIOUS

PDF

4.6 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: fc74a34aff9b53a04799d7cf2253930d SHA-1: 2ecbbc6aaaf24c6573aa2d35f9fefa21be945012 SHA-256: 4a6b43ca908c32e55630cd2d256674cafb1281d3d65af8da77ef576ac36eca0a

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 also strongly indicated maliciousness. The JavaScript stream, identified as 'javascript_obj0006_000.js', likely attempts to download and execute a second-stage payload, a common technique for initial access. The unescape() call suggests obfuscation of the malicious script.

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_obj0006_000.js` `394a2cad124642726f24a40c7655729c96661906d82b40e533ab822ed90cf7de`	pdf-javascript-stream	PDF /JS object 6 at offset 0xFC0	163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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