PDF malware analysis — malicious · 29049a02e7d28256

MALICIOUS

PDF

4.0 KB

MD5: 8d7d8b3f473528ff26d003cb50f0c262 SHA-1: 4b1b9e945ffedc82f9c74416c65be64dceff3268 SHA-256: 29049a02e7d28256731795426d9f7ce7113c1832506150a8b514b6d7c1a6e19a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to hide malicious functionality. The extracted artifacts 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are likely components of this obfuscated script, which probably downloads and executes a second-stage payload. Due to the obfuscation, the exact payload and delivery mechanism cannot be definitively 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` `748651a4a14c62f1cd9c84b7f11fe09d28fac21f42f191a49b59adb2f5eefc33`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6297 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` `d453d7cb4493cea783f6db1c481dc1ae2c2827aaee42cb4d557e0102cb6a02d1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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