PDF malware analysis — malicious · 5bb393ed4d2bfbd2

MALICIOUS

PDF

3.2 KB

MD5: 91160880ee6274d526c59ae6360fdce0 SHA-1: f5cfd870b077c5af3496999cb90b6c47c0b8e433 SHA-256: 5bb393ed4d2bfbd2e2abff56704e6d7c3b9fe6e0f1534133265b01f968fbda16

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 an unescape function, a common indicator of exploit attempts. The JavaScript appears to be designed to execute arbitrary code, likely downloading and running a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent, pointing towards an exploit targeting PDF viewers.

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` `2484b327ade905a694f783d7199bbc1e9ca9e4a99653e11cafea6e04caa90e64`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9D5	497 bytes

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