PDF malware analysis — malicious · a73e2cb042f25a38

MALICIOUS

PDF

4.3 KB

MD5: 5f370738bda587ad6c01052a7c33a134 SHA-1: 9227b198962315984ba16b9bb80fd9f8fd00dd17 SHA-256: a73e2cb042f25a38eaa8c3d79dadaf6ca50513415d12567436851e56a3ab3c3e

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The heuristic firings suggest the JavaScript is designed to be executed, likely to download and run a second-stage payload. The presence of a suspicious extracted JavaScript file further supports this. The exact intent of the script is difficult to determine due to obfuscation, but it is clearly designed for malicious execution.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj3791_000.js` `4a7b1fafbd686d68e54ad511a65371350bb60c1165f3f044810033050363d323`	pdf-javascript-stream	PDF /JS object 3791 at offset 0x134	8293 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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