PDF malware analysis — malicious · e8328725121f3a52

MALICIOUS

PDF

4.0 KB

MD5: 38878c3cf73bb962d13b99d0a9915391 SHA-1: 06a6aeb971f8cd22bc4118eb74d88609032eab7c SHA-256: e8328725121f3a52bec325da13348d74e8d5df932808cebbf3ce05b4c3a40f34

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests obfuscation and dynamic code execution. Two JavaScript files were extracted, one of which is a deobfuscated version. The primary function of the embedded script appears to be the execution of further malicious code, likely downloaded or staged from an external source, 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` `b911c61c413bab3a4a5bff3a552486568d76b11af1d68995f762229dab6a9487`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6309 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` `361daa64d45c38074f95a64695c76432c89a107a261f82382ec7762a4ae3a1a4`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3577 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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