PDF malware analysis — malicious · 945a33931b091b5c

MALICIOUS

PDF

15.7 KB

MD5: 3c8c8e133ebac43b1618b77af142d5e6 SHA-1: 7becd73d751cbd021c270f8dcf9b26ad292e242d SHA-256: 945a33931b091b5ca8864f7630fa88834129e0fdddea58411dabe1585e6c20ce

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes eval() and String.fromCharCode() for obfuscation, as flagged by PDF_EVAL and PDF_FROMCHARCODE. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the suspicious extracted artifacts and obfuscation techniques. The exact payload or download URL could not be definitively reconstructed due to the heavy obfuscation.

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_obj0004_000.js` `b91e6b1e4c330436b7736f9ec010d069c97da51f5ecbf7f45bc66d6bbdc158f0`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	298 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `1a46f845e4e4e9ecc265d236d3d2e36e1541c67f0caff85f43126d436794c6fc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A77	12068 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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