PDF malware analysis — malicious · 5b71f3d1c4fe1159

MALICIOUS

PDF

4.9 KB Created: 2010-07-30 08:34:51 Authoring application: Qoperohaxomauecoviy (via 1e076Riniuaruijoxe)

MD5: 6c0a3200ea42c08ac089a27d3a67a08b SHA-1: b1cf04af37e77c168dd17cea0e04c169b12b28b0 SHA-256: 5b71f3d1c4fe1159314b00f6557cff1d0affa09310269c199770174dedf9e4bc

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that utilizes an eval() call, a common technique for executing malicious code. The script appears to be obfuscated and attempts to decode a payload before execution. The ML classifier strongly indicates maliciousness, and the PDF JavaScript exploit cluster heuristic further supports this. The script's primary function is to decode and execute a second-stage payload.

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 (matched inside decoded stream)
Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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_obj0011_000.js` `102bd53c3d5aca19d3fddf2959dd86439856f01b130576912f06ee24f2e34ef8`	pdf-javascript-stream	PDF /JS object 11 at offset 0xE66	487 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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