PDF malware analysis — malicious · f867db85e2195587

MALICIOUS

PDF

75.6 KB Created: 2010-03-05 10:05:49 Authoring application: kRTwKkPAvsth (via fPIrs)

MD5: f7e790b019c9cee91c472bda2cab7bca SHA-1: 905515abcef8e8ed21f2fb5e439a282ddf8d5246 SHA-256: f867db85e2195587b8425be546873e270ac754e8707c81e7d615368e05d5d1cb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample was flagged by a machine learning classifier and ClamAV as malicious (Pdf.Dropper.Agent-7325798-0). Static analysis revealed embedded JavaScript, including the use of `eval()` and `String.fromCharCode()`, indicating obfuscation. The primary function of the embedded JavaScript appears to be the execution of malicious code, likely to download and run a secondary payload. The presence of JavaScript actions and streams strongly suggests this attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7325798-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7325798-0
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_obj0007_000.js` `03b485fbee8ca3b89b19db009e689a66e2ba7565a2b312b6f0bd07878b810302`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23E	76233 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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