PDF malware analysis — malicious · 626d5bedda85055c

MALICIOUS

PDF

3.2 KB

MD5: 495672bd87d9c43863afacb3dc3ae9ce SHA-1: 91828b103843c2eb153748944d4b0e4c3220d681 SHA-256: 626d5bedda85055c7b52dcdba910121a4a844e555e5eda60645125b9d4f10d2a

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical PDF_JS_EXPLOIT_CLUSTER and PDF_UNESCAPE heuristics, along with ClamAV detection as Pdf.Exploit.Agent-36121, indicate this PDF is designed to exploit a vulnerability. The embedded JavaScript attempts to decode a string from the PDF's title and execute it, a common technique for downloading and running a second-stage payload. The ML classifier also strongly flagged this as malicious.

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` `b2c2561983df955d85b2de93c37ca76d376b154c97618e3978f203997abb3857`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C8	460 bytes

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