PDF malware analysis — malicious · 5f8f2f7bd99890ff

MALICIOUS

PDF

3.2 KB

MD5: 29854af7e2d8d3db96f1793e77f65ef3 SHA-1: f112261f363b5aaee3d8cfb36544ab7d83d9c24e SHA-256: 5f8f2f7bd99890ffaf708bf298ecd12d5fbd4cfb8425fef999a6e5a8e218a891

206 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is obfuscated but appears to leverage the unescape() function, a common indicator of PDF exploits. The script attempts to execute code, likely to download and run a secondary payload, as suggested by the PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics. The ClamAV detection further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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-36121 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36121
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `34d80f3f060131d2206c71023bd8e9d3e2c359349314b041838d83e579916e29`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9D7	409 bytes

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