PDF malware analysis — malicious · 88b0c9188f61b312

MALICIOUS

PDF

3.2 KB

MD5: fa60c180f0b02b1196ca455c50e2aecb SHA-1: c5c02b185af20fbafbe5e6de56299a305801be70 SHA-256: 88b0c9188f61b312c42de061f445e9fcfb6ca9ea9947438643215196794c6166

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 be designed to exploit a vulnerability. The JavaScript attempts to decode a string and then execute it, likely leading to the download and execution of a secondary malicious payload. The presence of PDF-specific exploit heuristics and ClamAV detection strongly indicates 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` `bcd342221ac516445aa2e25050fa45d81e86030ac9352940f14aeea833445d96`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C6	486 bytes

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