PDF malware analysis — malicious · 1f0400d47b6a9f1b

MALICIOUS

PDF

4.0 KB

MD5: 40e29d6c8f29b9a9be7e4efe317e3fa8 SHA-1: aaa181c875dea0b3da59c506340cc56b7441025d SHA-256: 1f0400d47b6a9f1b9a294f7ee3b53020fc4557a4b75a64a3b50f374a4d7b6cfa

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical PDF_EVAL heuristic firing suggests the JavaScript is being used to execute code, likely to download and run a secondary payload. The ClamAV detection of 'Pdf.Dropper.Agent-7685770-0' further supports this dropper functionality. No specific family could be identified, but the attack pattern is consistent with a malicious PDF dropper.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7685770-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685770-0
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` `4560facc7cbf08882b2a08ba7341e3628d72ba41573b79cedb744a88fa5e56bc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 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` `db2526db895f0c3fb77913dcd0d3e574a9b9cadcbb2b14015e55f85d18387303`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3604 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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