PDF malware analysis — malicious · 5baf2d8572137da2

MALICIOUS

PDF

9.5 KB Created: 2009-06-15 10:50:27 Authoring application: wpQQvoxbQkSgMjKDN (via OqoDYpkvKtJjzEKNVnN)

MD5: 488dbe4a1678126dc67e6732b7d24abc SHA-1: d6b8d3d3b60139c28aa6444185c59d176ee7a1c7 SHA-256: 5baf2d8572137da242d0ff8edd5f1aa59b24d6bde1beb67ddad8e43c11e24599

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript that utilizes eval() and fromCharCode, indicating an attempt to obfuscate and execute malicious code. Heuristics and ClamAV detection confirm this is a known PDF exploit. The script's primary function appears to be downloading and executing a second-stage payload, as suggested by the complex, obfuscated string construction which likely decodes to a URL or command.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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_obj0009_000.js` `313421574114da1504cf04af085dce3dfe4960b5240c0ddcdf26e52ced2a144f`	pdf-javascript-stream	PDF /JS object 9 at offset 0x64A	7271 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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