PDF malware analysis — malicious · 77d0e0519f33cda5

MALICIOUS

PDF

35.5 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)

MD5: 93b4abf0cfaca3dda86e10f80e20d219 SHA-1: bda40e7528e4441112efc2ac7d7abd1fa872572d SHA-256: 77d0e0519f33cda5747829d3a348234f8c439bcc90a3108d5d2405630981cbda

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains heavily obfuscated JavaScript that utilizes eval() and unescape() functions, indicative of exploit code. The ML classifier strongly flags this as malicious. The JavaScript's primary function appears to be downloading and executing a secondary payload, though the exact URL is obfuscated within the script's string concatenation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `de384e3f639a675dbac3ec97480ed540e599788ab0d17ffcfdc6bc52fdea9ba3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `607764f37e171ef635f01335393f0f09366fd95ee020c009b0f055b7c407e94f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35039 bytes

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