PDF malware analysis — malicious · 5df234f57e4d815e

MALICIOUS

PDF

16.8 KB Created: 2009-05-14 16:05:06 Authoring application: mY5wAncp4l6WA (via xFOgaWI)

MD5: 34ef2ddb9f989d25d385daa58b6fd19e SHA-1: a835c8241bec4aaae50d8dd3e87ddf2594663994 SHA-256: 5df234f57e4d815e615eb526bf3b7ebf8071422909396ef241bb8baa228ab930

156 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 `eval()` and `String.fromCharCode()`, indicating an attempt to obfuscate malicious code. The ML classifier and heuristic firings strongly suggest this is a malicious PDF exploiting a known cluster of JavaScript vulnerabilities. The embedded JavaScript, named 'javascript_obj0007_000.js', is the primary indicator of malicious activity, likely serving as a downloader for a secondary 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)
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` `2810aa2bed7ac28d0bedae7b378c801d938c7da5cb31471c0fa02c3211ed31e6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x237	15963 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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