PDF malware analysis — malicious · 452176d1a54cfcca

MALICIOUS

PDF

4.0 KB

MD5: 5fb670f4ba56e6a2953b657947cbb4f8 SHA-1: bc538ce9667b95921078e555afe2df8e8d346a62 SHA-256: 452176d1a54cfccaf34c11a5eb1e7ce033dc340392efb00af46d276f084813ff

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing eval() and String.fromCharCode, suggesting an attempt to hide malicious code. The heuristic 'EXTRACTED_FILE_STATIC_TRIAGE' flags a long encoded blob and script obfuscation, further supporting this. The primary function of the obfuscated JavaScript is likely to download and execute a secondary payload, which is 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` `125516888165bf1d95baccc04bcab9be94898e5f99f7b344ffc4a2bf43fb5632`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6257 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` `bb896a0e4ff09ff9abef4ca562e7ead428d6f2a30ee4de5b81e05b0de9d27973`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3539 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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