PDF malware analysis — malicious · 05b3acc7688b4443

MALICIOUS

PDF

9.6 KB Created: 2010-09-14 03:36:19 Authoring application: gkOSPdXCtoC (via QRozi)

MD5: 5f90ea673128ff709c3fbd7012620c30 SHA-1: d44d3a8b13909198661bbfeeebbcebe894edb9a9 SHA-256: 05b3acc7688b4443b02ae3779d54ba933f4d54491d441f0d08202ec7e917496c

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER, which is designed to execute malicious code. The ML classifier strongly indicates maliciousness. The script likely downloads and executes a second-stage payload, a common technique for initial compromise via malicious attachments.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `7cd51eef8aab57de1d699327d1ec3e37e0f2f3a6fc3ae47f21eaf75b735f35ad`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23E	8408 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.