PDF malware analysis — malicious · 9b95f4d74aaf9ebd

MALICIOUS

PDF

4.0 KB

MD5: cbdd822d0305f4bdde3cb5970735185d SHA-1: d7045b93fed5bb7c11f0f51c7b3c88dd2aef962b SHA-256: 9b95f4d74aaf9ebd35500102a5bd7ce3bb364ab99b6faa931d78fa2ff8929458

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript streams, one of which is heavily obfuscated and uses `eval()` and `String.fromCharCode()`. This obfuscated JavaScript is likely responsible for downloading and executing a second-stage payload. The presence of these techniques and the suspicious extracted JavaScript files indicate a malicious intent, though the specific family cannot be determined.

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` `fed40d719bee08250b728bb51f3b21f331d7106f03a60e7406fa6621a5f3d8c7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6313 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` `7a4c73f6f784bbfedf9a49287c0813646dfb1ac104511d2ca2462920deed56d9`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3580 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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