PDF malware analysis — malicious · 2ed00d985552f318

MALICIOUS

PDF

4.0 KB

MD5: 4d4846ee6361ad953fb254ee219bcc2d SHA-1: 23b60d92622b7c1b2147e3bba276e6f76f097a4b SHA-256: 2ed00d985552f318c6b23dd42c37f56d772159e8da6144cac6d5ca422c8778b1

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: 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 JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The presence of 'acroform_b64_00.js' and 'javascript_obj0013_001.js' as extracted artifacts further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, though the specific URLs are not directly visible in the provided evidence.

Heuristics 5

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` `54f1122f84aa6f61e22e39de16216aef2a48de10fa21313bb1e5a6abc29c9f3a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 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` `20206cdc2c4f4c256958298b4578d2b3d074ea60afa665cd0cedd9bc13359463`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3575 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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