PDF malware analysis — malicious · c052c681336eb758

MALICIOUS

PDF

2.8 KB

MD5: 1c6b3b01e05ae18b7fcf932302fd7eaa SHA-1: 4a0a8057a4eb41a9d4cc05064517d54df1b3e7e7 SHA-256: c052c681336eb758422146e4d418df9ace66836090ed3db5954bf570cfda7898

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged by ML classifiers and ClamAV as malicious (Pdf.Dropper.Agent-1828926). It contains embedded JavaScript streams, one of which utilizes `eval()` and `String.fromCharCode` to likely download and execute a second-stage payload. The obfuscated nature of the script prevents a more detailed analysis of its specific actions, but its presence strongly indicates a dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1828926 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828926
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. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `7ac8b15a8e337eed8df212a6a9f6d2027f2b78a6fdcc3329c6a686f5c1ca520c`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `000a1731d4dcf027cd3f417f2a8e6de8bdf918a8aa972ec1288c52600688b280`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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