PDF malware analysis — malicious · 8dfca4ebfb7e9451

MALICIOUS

PDF

27.8 KB Created: 2011-05-26 16:36:38 +03:00 Authoring application: bing.wiki.usfca.edu (via mPDF 5.0)

MD5: 99d72d2184ba2f686526de096d681307 SHA-1: c9b1ed4e9b4ebeb980bd90058f2d29467d5b113f SHA-256: 8dfca4ebfb7e9451edd88fcef39bf95b866d2eb37cdf4ea7f8270a28cb86b7d5

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly suggests maliciousness. The presence of a JavaScript object and the use of unescape() point towards obfuscated code designed to download and execute further malicious content. The extracted artifact 'javascript_obj0022_000.js' is a key indicator of this behavior.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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` `10e15f9e8e631690248396d575e9652903435250e89141f7cc58e4b3e9b10d1b`	pdf-javascript-stream	PDF /JS object 22 at offset 0x67DC	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_off00001267.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1267	17756 bytes
`font_01_sfnt_off00004079.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4079	17892 bytes

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