PDF malware analysis — malicious · e7a42b7796457fd7

MALICIOUS

PDF

29.9 KB Created: 2009-09-03 14:10:44 Authoring application: RuPKeGRJWSzQFe (via dKrYZbyKlrDuiSTZURR)

MD5: acf1a884596ec4852fd9470c324bb7c8 SHA-1: a9c153a51433ded987926ad96eb81d0aa45aac20 SHA-256: e7a42b7796457fd7ddf4a8ca56ce8d12a33f6b25a99722c263702e69eb6f3866

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7318056-0. Static analysis revealed embedded JavaScript with obfuscated calls to eval() and fromCharCode, indicating an attempt to hide malicious code execution. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the ML classifier's high confidence score.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7318056-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7318056-0
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_obj0015_000.js` `e2747d1cdbd381c5c109b74268ed73e27121a6b64c801546a287de641eee3ed4`	pdf-javascript-stream	PDF /JS object 15 at offset 0x3566	15956 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).

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