PDF malware analysis — malicious · 41779068094452e4

MALICIOUS

PDF

23.3 KB

MD5: 6f11eec4a19c9af581efc11f473a0dec SHA-1: 680eeb15458999b688b8a559e26a6f9a13a97362 SHA-256: 41779068094452e4d7798faf54e21385f2305e34893901754011de4f55c2d33a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() functions, along with String.fromCharCode. This obfuscation is a strong indicator of malicious intent, likely to download and execute a secondary payload. The presence of ASCIIHexDecode and ASCII85Decode filters further supports this. No specific family could be identified due to the heavy obfuscation.

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` `41b85b352566cdf5433d1a43e699608832fbd07da1d5ce3e5141aea5b1c53f26`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x5ACB	252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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