PDF malware analysis — malicious · a09c6e80636d371e

MALICIOUS

PDF

28.7 KB Created: 2011-05-26 16:36:41 +03:00 Authoring application: bing.wiki.usfca.edu (via mPDF 5.0)

MD5: 22f971eb8d13f3aac4a3e82373dfd1ea SHA-1: 2e7f71411467d4a81fc17627b4be2c7e6f84a626 SHA-256: a09c6e80636d371eade642f6d1673e8df90aac75f8455f856b8a7aa5ede9eb60

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The JavaScript stream was obfuscated using unescape(), a common technique to hide malicious code. The extracted artifact 'javascript_obj0022_000.js' is suspicious due to obfuscation. The script likely downloads and executes a second-stage payload, contributing to the overall malicious nature of the PDF.

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` `10e15f9e8e631690248396d575e9652903435250e89141f7cc58e4b3e9b10d1b`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6A28	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_off00001464.bin` `72bbdf6a2ae962929b11509f0bf312f43255d015b3835af122bec1b9f589442c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1464	17880 bytes
`font_01_sfnt_off000042c5.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x42C5	17892 bytes

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