PDF malware analysis — malicious · 93c1ff64d3763e8d

MALICIOUS

PDF

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

MD5: 13fc0f32374d86c3c8f6ab1a05bcf272 SHA-1: f6ca5585d0eb9b33dcbc0f675cfc30a827c1ca10 SHA-256: 93c1ff64d3763e8db5b65e730e932cc690ec20ec897ee0e6c44e49150d76fa46

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file flagged by ClamAV as Pdf.Exploit.Agent-36118. Static analysis revealed embedded JavaScript streams with high-severity heuristics for PDF_EVAL and ML_NYX_PDF_MALICIOUS, indicating malicious intent. The JavaScript appears to be heavily obfuscated, using string concatenation and eval() calls to construct and execute code, likely to download and run a secondary payload. The presence of multiple JavaScript streams and the ML classifier's high confidence score support this assessment.

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` `66e5e689e075b5752342f1a4f4b28ab89ca0e99dd830b08ee6dd6bdbba428b8c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`javascript_obj0013_001.js` `786d8f86c07c7923c22f995fbc9dd2893d658a95ed0e23cb8971d9ea0c2d7b76`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14258 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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