PDF malware analysis — malicious · c5445ad5b704ae5b

MALICIOUS

PDF

4.1 KB

MD5: 47a2fd51f6349e4807af874fa10fc5a8 SHA-1: a9d54700ac16c082cc1582947920ae0dae99127c SHA-256: c5445ad5b704ae5bd57fc9fbd83972501368d1b7b8c9056de4a0ac6deeadf1e8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage suggest obfuscated code. The ClamAV detection 'Pdf.Dropper.Agent-7301064-0' strongly suggests this is a dropper. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, a common dropper behavior. No specific family could be identified due to the obfuscation and lack of further indicators.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7301064-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7301064-0
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. (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_obj0013_001.js` `14ed118cf6cbb73744603901a035b1d86d337110b514645ccce72c441feb8264`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6349 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `58eb17b3c5c58043355007ce674662328224401b1eb97529b50a0635bde2c944`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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