PDF malware analysis — malicious · 31c6c85ccf3a8273

MALICIOUS

PDF

22.8 KB

MD5: c19cf358beacbbd1b7dd11a86cc6ecc2 SHA-1: c5fde8555ec09b5938405cc9e6b1e70089444d35 SHA-256: 31c6c85ccf3a8273d4824a12a3e0ffc9113d7b28113b66dc6b48afca6820eaa7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1566.002 Phishing: Spearphishing Attachment

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() functions. This obfuscated script is designed to execute arbitrary code, likely downloading and executing a second-stage payload. The presence of JavaScript actions and streams within the PDF, combined with obfuscation techniques, strongly indicates a malicious intent to compromise the user's system.

Heuristics 8

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `83945e09d8deb6e8659dc92dd40c8e708845c1a8d9e0fc3217679ee78200648a`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x58F9	253 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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