PDF malware analysis — malicious · 855e3e3721054c07

MALICIOUS

PDF

4.0 KB

MD5: 4c081b21d394ff9da715b77501a9af74 SHA-1: 1314ff9a844627997b99eb877f42ea9f1cdcb25a SHA-256: 855e3e3721054c0768a30f5db8b9cda3d05a05e63a18aa06bb112ea83d64858a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical ClamAV detection 'Pdf.Dropper.Agent-5343180-0' strongly suggests malicious intent. The deobfuscated JavaScript file 'acroform_b64_00.js' likely contains code to download and execute a secondary payload, a common dropper behavior. The presence of eval() and String.fromCharCode further supports the obfuscated nature of the script.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-5343180-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343180-0
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` `642ba357d2e3265fb721430409c5a02c9337d3a0940185631bf89f3937fc1ae0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6261 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` `8e49a103e4125157999f81b57f34905c0315ace2f1d3fa98566ff3441edd01ba`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3541 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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