PDF malware analysis — malicious · 4cf32145b1d6af5f

MALICIOUS

PDF

4.1 KB

MD5: d4efe0009d883c38b219390bda4c08f9 SHA-1: 06528dfa2538c2f4a72e9c5dda4895e54e7397fa SHA-256: 4cf32145b1d6af5f90cfa83db80332f8843ba342d911076592ec7765a0cc78eb

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 and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute malicious code. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted, and its presence along with the 'Long encoded blob' and 'Script obfuscation indicators' from static triage strongly suggests the PDF's purpose is to download and execute a secondary payload. The exact nature of the payload could not be determined due to the obfuscation.

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` `9dce7c3cce2d2c269217f22dfa8a5739baa2b25d4812f0a8ca582cf1aae5dbfe`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6469 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` `8148502364b9a0184a7bf3205cd7bce3c0c80e5b727cd534f1b4db7eab868182`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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