PDF malware analysis — malicious · 6e20794bd5c4172f

MALICIOUS

PDF

74.0 KB Created: 2010-03-09 00:18:19 Authoring application: z0bG9ClB (via HirsaxwqOU)

MD5: 0129095f77d31a4670dfbed5b45b221e SHA-1: 84718f78246fa1d1d5f253ee80da783a8738f85e SHA-256: 6e20794bd5c4172f03aecbab470799ee431b52ec91cd5ef6789235a60155b2ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()` functions, indicative of obfuscation and potential exploit code. The ML classifier strongly flags this as malicious. The embedded JavaScript is likely designed to download and execute a second-stage payload, as suggested by the exploit cluster heuristic.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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` `1bec3d68385d891d61d4eafacdb1041ba0d9b565130ed5a5620404b4342ea9f2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x242	74554 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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