PDF malware analysis — malicious · be783ae9cc44e943

MALICIOUS

PDF

30.6 KB Created: 2009-12-08 06:02:16 Authoring application: hPwDadzOnUwvGntd (via jostqMxdsrFbz)

MD5: af903397a0cdab9078ae77ceddf29016 SHA-1: a56e6ccbd766646cf45c8e63bd698e6601eec032 SHA-256: be783ae9cc44e943da62e24535f57f48ebd027a7e876de8956236b8ce0e05a36

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a dropper. Heuristics indicate the presence of embedded JavaScript, including the use of eval() and String.fromCharCode, suggesting obfuscation to hide malicious code. The embedded JavaScript likely downloads and executes a second-stage payload, consistent with a dropper's function.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7217289-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7217289-0
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_obj0019_000.js` `c66a2fca8ecadefcd075e5111a759c05aeff6eacca281240e530d2d674c9a1ab`	pdf-javascript-stream	PDF /JS object 19 at offset 0x3CBF	14763 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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