PDF malware analysis — malicious · a04097d61676018e

MALICIOUS

PDF

4.0 KB

MD5: 60618fb57ab6686cbfcbb71efec1daf3 SHA-1: 18ed6ed45ed7773528ed340875ebf99a6a2baeff SHA-256: a04097d61676018e98428046cb9f1bb902aedc9a2d490232d132d96bac0fbd0e

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings, along with the 'Script obfuscation indicators' in the static triage, suggests that the JavaScript is heavily obfuscated and likely attempts to download and execute a secondary payload. The deobfuscated JavaScript file 'acroform_b64_00.js' is a key artifact. Due to the obfuscation, the exact payload and delivery mechanism cannot be definitively determined, leading to an 'unknown family' classification.

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` `66e4e42fae5e985dc34b918e0ad06ae1c5adf6367911ad2542d41d073324113e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6245 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` `dec0c7e4dfb3956ee94ff1b08778e37677fab106fc8cddc69f4234c145bc58dd`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3530 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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