PDF malware analysis — malicious · 79393b388054efd4

MALICIOUS

PDF

30.3 KB Created: 2009-05-01 21:21:45 Authoring application: ghjkSFghjkCPx (via afdsdgf)

MD5: 15b5716f7af05051cced953c26cb9b7e SHA-1: 34e5e603580ce7135cc5c098992612bafd910349 SHA-256: 79393b388054efd437571353a3cb8fa09efe4b169570035ef76449f640d29e77

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that is flagged as an exploit cluster, including eval() calls. ClamAV also detected the file as 'Pdf.Exploit.Agent-35587', indicating a known exploit. The JavaScript is heavily obfuscated, but its presence and the exploit heuristics strongly suggest it's designed to download and execute a secondary payload.

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-35587 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
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_obj0007_000.js` `1d4a9b689be8c549b0242e7653ce2b134800935a38f0f9ba258cc482cc0fa3ce`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29850 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `7eb5c3999c6b20364917e7c78536645c52ee4c7247f7d2b9f2803a5fe0bd9017`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	28937 bytes

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