PDF malware analysis — malicious · 1f15d82582b36d75

MALICIOUS

PDF

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

MD5: 37f498b19b8b5524d8d9ca94f4c925ea SHA-1: da7c3207c66e596fb93535f0170a84bf6d075a4b SHA-256: 1f15d82582b36d758b0a30763b3511a9c5466f9fd2dc7071c642c1d8c12f096c

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.002 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV with the signature 'Pdf.Exploit.Agent-36118'. Static analysis revealed embedded JavaScript streams with high-confidence heuristics for PDF_EVAL and ML_NYX_PDF_MALICIOUS. The JavaScript contains obfuscated code that uses eval() to execute further commands, strongly indicating it's designed to download and execute a second-stage payload. The reconstructed string 'Math.random().toString(36).substring(2,15)+Math.random().toString(36).substring(2,15)' is used in the obfuscated JavaScript, likely to generate random strings for further obfuscation or dynamic payload generation.

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` `6929ab2608719ab0fec77ed9f76e4f7f00914530919a90117e0f919cb5ccef93`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13365 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 12 long base64-like blob(s).
`javascript_obj0013_001.js` `0e438f5fccbc73a2a5fb5e01e8297d584fa61ba3b1f2ec2d0b5f59911dcb99e0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14071 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 12 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.