PDF malware analysis — malicious · 75a8e75e9a341b89

MALICIOUS

PDF

3.2 KB

MD5: 83a0867fd710e200d68fb5cc55cfd32c SHA-1: af922ab000d2240d88a25e1bc2029d586c265500 SHA-256: 75a8e75e9a341b89396610a6d5b614b2bc34003058e5f1dca89c3e0b30c814e6

206 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 utilizes the unescape function, a common indicator of exploit activity. The script attempts to decode and execute a payload, likely leading to the download of a second-stage malicious file. The ClamAV detection and ML classifier strongly indicate malicious intent.

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` `89fb0525ef75459d0ffd38e31b6a980b36149fb739df4275d0560666c4cecfca`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C6	476 bytes

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