PDF malware analysis — malicious · 1f5ba3fe128b84c4

MALICIOUS

PDF

23.2 KB

MD5: 0da6d3b68d03d6568df5ec081fb9424d SHA-1: ed58b37eefe82a5ac8e6d366c16f441b54540f02 SHA-256: 1f5ba3fe128b84c4c51f07a425b1516bfc533138b5b2350895a46b583d52fcea

134 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, which is heavily obfuscated using eval() and unescape() functions. This script is likely designed to download and execute a second-stage payload. The presence of PDF-specific filters like ASCIIHexDecode and ASCII85Decode, along with JavaScript obfuscation, strongly suggests a malicious intent to exploit vulnerabilities or deliver malware. The extracted artifact 'javascript_obj3332_000.js' is the primary indicator of this malicious script.

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` `a105524e6b35a3c7073fa1b7ddac1213d09b678be79c3d2a6932bf8e2a597a30`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x5A53	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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