PDF malware analysis — malicious · 5378da52f9413d49

MALICIOUS

PDF

14.5 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: ee9166cb68ee4cf2e174f48ea520004d SHA-1: e34846d9903f56513e098e07fd2978e3aa0d13d4 SHA-256: 5378da52f9413d490ddfce76cbc4a18d57fe938078f241929b72fc1e946ed666

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was detected by ClamAV as Pdf.Exploit.Agent-36118, indicating it contains a known exploit. The presence of JavaScript actions and embedded JS streams, coupled with a high-severity 'eval()' call, strongly suggests the execution of malicious code. The ML classifier output of 0.999998 further supports the malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36118 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36118
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.
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_obj0013_000.js` `5305cdbb3674fd00080f025abe3d5ebe311d8730edb0e56d4b38866275a78822`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).
`javascript_obj0013_001.js` `79015bd6c50c8dea7c66780f6ed92066daf27a0f7a27146c727958acdf011252`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14010 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).

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