PDF malware analysis — malicious · 245dd3d0b01553f8

MALICIOUS

PDF

15.3 KB Created: 2009-04-17 07:44:54 Authoring application: YJdHyZUE07vg (via KFmVnWboy7Y6X)

MD5: 9a414e200d7c4ae681294cb88ea893bb SHA-1: fc9a17b3e5617d71a2f9f5da076e432c41fec3b7 SHA-256: 245dd3d0b01553f836e6a168edf0a7352a5e59f25a1388e1ac4cb484f36ad9f3

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier strongly flags this as malicious. The JavaScript is obfuscated, but the presence of eval() and unescape() suggests it's designed to execute arbitrary code. The primary function appears to be downloading and executing a second-stage payload, as evidenced by the extracted artifact 'javascript_obj0007_000.js'.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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` `bf6f2568fe2e4cd90752fd6ef48d3f98a8d718ee65ee2ae86e7140ef8f9ce84e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	14467 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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