PDF malware analysis — malicious · 9f34fd3d0384b38d

MALICIOUS

PDF

4.1 KB

MD5: 8e38db87ab3a89fa603a106abed958a6 SHA-1: a4028d09ec26d109e3640f93f33f744158da4d45 SHA-256: 9f34fd3d0384b38db729b020025db2d03ace24e11339e4955591bf529e0a8884

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 and PDF_JS. The critical PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and likely executes arbitrary code. The ClamAV detection of 'Pdf.Dropper.Agent-7685809-0' further confirms its malicious nature as a dropper. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7685809-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685809-0
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` `0f7371b8f0d476087f50512209f1f156fc8fa260595d21419f71262b5a3c6738`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6329 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` `87778aadbcfba5e6d1f046c876dc6c4d49e20d543e35685b2b4ae216a9c72f72`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3593 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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