PDF malware analysis — malicious · d5aa6624037e3e4e

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: 0b128d39d7f79287732db92a536eaeba SHA-1: 6e0917c217527d0cf1a32403004424778729bf11 SHA-256: d5aa6624037e3e4e2e78d086b5f1b9541e9552c0afc2b73384aa0db672d3132b

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript streams, with high-severity heuristics indicating the use of eval() and ML classifiers flagging it as malicious. ClamAV also detected it as 'Pdf.Exploit.Agent-36118'. The JavaScript appears to be heavily obfuscated, but the presence of eval() suggests it's designed to download and execute a second-stage payload. The document body contains obfuscated JavaScript code that reconstructs strings using concatenation and eval, indicating a complex execution flow.

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` `eab87b3a620700b3d8128a91094205a0d39d9b8858305112d643387f28254902`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13437 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).
`javascript_obj0013_001.js` `3ce3efa8cb7363d9945098921e420e5e4d16b4715c567e42dcb4f46a75ae97d9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14143 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).

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