PDF malware analysis — malicious · 6617efb29a54c7a0

MALICIOUS

PDF

2.9 KB

MD5: 25ab09cf4baa68c314e9f6d54d730b75 SHA-1: 97cbe0ab4cd718a5af1b0fea05903f83f1e6b0a3 SHA-256: 6617efb29a54c7a0468f07bf8623c050823fee9563beeeade67e18bda6abc9e7

148 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 eval() call to deobfuscate and execute malicious code. The script appears to be designed to download and execute a second-stage payload, as indicated by the large, obfuscated string which likely represents a URL or shellcode. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of an exploit-based attack.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `2694be79995a8a604f7bcd3a3900ea7ac5134000f8f2b48056b23703fff0edc2`	pdf-javascript-stream	PDF /JS object 7 at offset 0xDB	27753 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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