PDF malware analysis — malicious · 0e83155d1a26e887

MALICIOUS

PDF

3.2 KB

MD5: 9fe8efe758937ebe9aacce99fffea034 SHA-1: abf99fe602b63eb91ccc83eaee9835148e748026 SHA-256: 0e83155d1a26e88721ab01f6db0d55a366fc71ba05967cf45bc9b39e91b1c91a

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 code. The script appears to decode a string from the PDF's title field and then execute it. This behavior is consistent with a PDF exploit attempting to download and run a second-stage payload. The ClamAV detection and ML classifier further support 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` `b6a1d202b4a49cc535e457f31e01346dfb31ee812faa374119cb9adc5a510b13`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C5	494 bytes

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