PDF malware analysis — malicious · ecc18df0d2fa99da

MALICIOUS

PDF

4.0 KB

MD5: 7819caabe61b64dd047d0c803655b8fa SHA-1: 6a625296ac8d9526271d1d52fe14130539e687de SHA-256: ecc18df0d2fa99da58c6c90a478f3d0cf6fa21b13b545d6a6fd222586d353f9a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics suggest that the JavaScript code is obfuscated and uses dynamic execution methods. The presence of 'acroform_b64_00.js' as a deobfuscated JS file further supports this. The likely intent of the script is to download and execute a secondary payload, a common technique for initial access.

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` `d6eac9b382b0a9be82d97e670bd9736297dd84477d0d90777cc02e827d247f21`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6301 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` `907c9eb1e33eae00f3e9c7438c64b6acc3a5915d9b9d2a81b56ec36942b18465`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3573 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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