PDF malware analysis — malicious · 0f4b03bced5ec182

MALICIOUS

PDF

37.9 KB Created: 2009-08-26 02:03:11 Authoring application: QZbDSEYMVuNaOJh (via yRDUxZZkMxCArIwZrU)

MD5: 45f64b1540049ffff260fb33da2891cd SHA-1: 1d5af19cf6bf5d81ccbb5e2e6840bb867d7c84c8 SHA-256: 0f4b03bced5ec18227e5de8ad490e5192038ca7d4b591ab56991f5827ae0e392

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to obfuscate malicious code. Heuristics and ML classification strongly suggest this is a known exploit cluster targeting PDF viewers. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.
ClamAV: Pdf.Exploit.Agent-22546 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-22546
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_obj0025_000.js` `ce50aa52651465333ff70f8929b59596c2213102e16dcc71976bb0e2d2c7fe1c`	pdf-javascript-stream	PDF /JS object 25 at offset 0x541B	16078 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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