PDF malware analysis — malicious · 100f9f33778ff1fc

MALICIOUS

PDF

27.2 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)

MD5: 80125270f743b8d12dfbb726c306b881 SHA-1: a34e79e0c018d60256e841f5965ceb9b8962c13e SHA-256: 100f9f33778ff1fcc852df2d7b7fdbde9b0469a91f396b591ce94b80e523ce86

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded and obfuscated JavaScript, including calls to eval(), which is a strong indicator of malicious intent. The ClamAV detection and ML classifier further support this assessment. The JavaScript appears to be designed to decode and execute further code, likely to download and run a second-stage payload from a remote source, as suggested by the heuristic 'PDF JavaScript exploit cluster'.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.Dropper.Agent-7229644-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7229644-0
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` `3b191baf242c4651049a190f951aa5b61bb86f659ec07f9ca0a22ce8966b8f5c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	26719 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `52ead3abbb97987b3839f12165f1090a8a56bb37080f800fdb46af6eacc9ab6f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	477 bytes

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