PDF malware analysis — malicious · cdd850eefa7ecdcf

MALICIOUS

PDF

57.7 KB Created: 2009-06-12 04:10:10 Authoring application: NBbxrVQnxXGYLkP (via IoOPUXEPhCQlsYvPB)

MD5: d649f2ea0f258026aa119c72af76916e SHA-1: c2d4ba7a62eea4243dbeaf7acad144e86b48f8fd SHA-256: cdd850eefa7ecdcf02da94a50acf335535c6763e58f3132c4a0a095232fc6ce9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as Pdf.Exploit.Agent-1872. The embedded JavaScript, named javascript_obj0007_000.js, is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Exploit.Agent-1872 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-1872
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` `60264420e813396ecc50c490208c7e0fe659788dea162e59b88fec12b90d486d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4EB	57087 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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