PDF malware analysis — malicious · b3dfc3ced49f1f06

MALICIOUS

PDF

3.1 KB

MD5: 746ae7e3b394da7527c5a5cae85ba4d7 SHA-1: 17684a91855432bbc451f278747f15197ebdbdb8 SHA-256: b3dfc3ced49f1f0610c1f6333af6b2b5a289bd6c4fede9251080e52751dd943a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The critical PDF_EVAL and PDF_UNESCAPE firings, along with PDF_FROMCHARCODE, suggest obfuscated JavaScript code is present. This script is likely responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection name 'Pdf.Dropper.Agent-5343317-0'. The presence of obfuscated JavaScript and the dropper behavior point to a malicious intent to compromise the user's system.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-5343317-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343317-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0xB39	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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