PDF malware analysis — malicious · 663729cfacb2bc8f

MALICIOUS

PDF

2.1 KB

MD5: 9fd523d28ce3dda94f65a9e06b3de3d9 SHA-1: 5effed6acc992bae52a07e3b9c09bb5df0d1c54f SHA-256: 663729cfacb2bc8fe41f505a50b942bac04f4c9328da7c7f3e3b859a0038e89d

208 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes eval() calls, indicating an attempt to hide malicious functionality. Heuristics and ClamAV detection strongly suggest this is an exploit attempting to download and execute a secondary payload. The specific JavaScript code is too obfuscated to determine the exact download URL or persistence mechanism.

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.Exploit.Agent-2056 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-2056
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0002_000.js` `09b72c595c4d8450a94122687f230ec3aa5b16ad56ccd67a04cf505d23b82b60`	pdf-javascript-stream	PDF /JS object 2 at offset 0x5B	3516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).

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