PDF malware analysis — malicious · 2a9f52c36c8b3cbe

MALICIOUS

PDF

4.0 KB

MD5: 4e8132aed3330001ba267269824d3646 SHA-1: bbba058e61ca77b2b0cd2ce4413818c7f4499939 SHA-256: 2a9f52c36c8b3cbede4f63d84f6c55691e72364f724f66c3ff9441472a6247e3

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 suggests the JavaScript is obfuscated and likely executes arbitrary code. The deobfuscated JavaScript stream, acroform_b64_00.js, is a strong indicator of malicious intent, likely to download and execute a second-stage payload. The extracted file names also suggest script content.

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` `786e7c5612d4d2a5e95a1994d04e08361bf30b966500abfb871419eb390c2508`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 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` `faae128c06b551580e8096dcaa4335566c7916861cb21a6adb3347b482294281`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3604 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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