PDF malware analysis — malicious · 6c04caf98f092bfa

MALICIOUS

PDF

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

MD5: 009dcc8640293bbc1f709cf22384eb51 SHA-1: 90b9c2bf5f64cc09c25a4b8d4591f684a76d3bff SHA-256: 6c04caf98f092bfa1f40209a8ebeb6d157e4e7d7f4c03d71702ec0ff1d7bd774

268 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by multiple heuristics and ClamAV, specifically identifying it as a JavaScript exploit. The embedded JavaScript streams contain heavily obfuscated code that utilizes eval() calls, a common technique for executing arbitrary code. The primary function of this script appears to be downloading and executing a secondary payload, as indicated by the exploit cluster and ML classifier results. The authoring application and creation date suggest a potentially older exploit, but the obfuscation and exploit cluster point to a deliberate malicious intent.

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` `1f33268521b5a9620fecbf3d09a6f5097bc8f00bc4534a33fec725ec1ac90f15`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29965 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` `8345599164d361480e2900b120aa781ea8d883608721487c147ff7454cdd6e76`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29003 bytes

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