PDF malware analysis — malicious · 29fad1bf2df80725

MALICIOUS

PDF

3.2 KB Created: 2009-07-02 20:15:15 Authoring application: w4eKJwE6ARq9K (via lWuJykfKH)

MD5: 132bfe0e7e84ebd8894094d64dae1d31 SHA-1: 214a6a87d8b738d6ab9ac3ebfa1763e856f0c79d SHA-256: 29fad1bf2df80725c81db3d4fa5d14f9a1f3bb298f7c5a50267cfa61e9ad3eeb

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection (Js.Exploit.Shellcode-18) strongly suggest malicious intent. The unescape() call and the extracted JavaScript artifact point towards an exploit attempting to download and execute a secondary payload. The ML classifier output of 0.999960 provides high confidence in this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Exploit.Shellcode-18
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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` `f33c7a924c7176940752e3a3cfbff5e38a9305eb12d737baf1f8939e200c5415`	pdf-javascript-stream	PDF /JS object 7 at offset 0x249	1955 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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