PDF malware analysis — malicious · 890a93c0301d269a

MALICIOUS

PDF

144.2 KB Created: 2010-03-30 17:05:37 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: d291d60706677ca0978571aa88881086 SHA-1: d1c337269094349b9e8b38798267a5cb3502087a SHA-256: 890a93c0301d269a188b521632efe9b30a2c774d911e79c8b4611ca4e6c72fee

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with high-confidence heuristics detecting eval() and unescape() calls, indicating obfuscated code execution. A secondary embedded PDF was also found with similar suspicious findings. The primary function of the embedded JavaScript appears to be the execution of obfuscated code, likely to download and execute a second-stage payload from a remote source. The extracted file 'javascript_obj0014_000.js' is also flagged as suspicious.

Heuristics 6

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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)
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.
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_obj0014_000.js` `f88a00e927e26df17805ed162ce7be240b356db723ca38aa13d59e510c6f437e`	pdf-javascript-stream	PDF /JS object 14 at offset 0x2CC	4691 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`polyglot_child_pdf_off00022878.pdf` `abad74148293fed1c94e71e6dfb426167a66622075120c663eca3156f2f57670`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x22878	6183 bytes

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