PDF malware analysis — malicious · 7fe9c003625e1df0

MALICIOUS

PDF

28.2 KB Created: 2012-09-11 16:54:07 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: d4e74f2fad22bd50196e4734ab90291e SHA-1: 81878fb71e9c33fd1c5b93035899c5f82f7d02fc SHA-256: 7fe9c003625e1df03651d9fa52efe8892c2b48395c323034b17ef6f09e951db8

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits high-confidence maliciousness based on ML classification and the presence of obfuscated JavaScript. The JavaScript stream, identified as 'javascript_obj0022_000.js', is heavily obfuscated using unescape functions, indicating an attempt to hide its true functionality. This script is likely responsible for downloading and executing a secondary payload, a common technique for initial access and further system compromise. The document body is unreadable due to truncation and encoding issues, preventing a more specific content-based analysis.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0022_000.js` `b549138dc1b00ea70ede2671460e6cd42d9e1c3bb812bf9653550df0951c4991`	pdf-javascript-stream	PDF /JS object 22 at offset 0x68D0	136 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 hex-escaped blob(s).
`stream_003_off0000135b.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x135B	17756 bytes
`font_01_sfnt_off0000416d.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x416D	17892 bytes

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