PDF malware analysis — malicious · 6fa8fe5c8de3db1d

MALICIOUS

PDF

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

MD5: 5fc49ea5e1cf8b05abefb1e30ee92090 SHA-1: 3212ab24713dbfc23f02432f4c958149bd2db6c9 SHA-256: 6fa8fe5c8de3db1da373ff5239e77be579611eb184a986dc8714cedf5c75942d

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file containing obfuscated JavaScript, as indicated by multiple PDF JavaScript heuristics and ML classification. The JavaScript utilizes eval() calls and string concatenation to construct and execute malicious code, likely to download and run a secondary payload. The ClamAV detection 'Pdf.Exploit.Agent-36118' further confirms its malicious nature and exploit capabilities.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `ef03826b7a06a7a4eb1cf241a581a5e379beac9f9cb0deaa51cf4658761504e2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13688 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `2fc6400737b028a306db967e1f4515f8cf68d272a8cbf5377076c02987934b11`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14394 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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