PDF malware analysis — malicious · d7ef7626b2a161c6

MALICIOUS

PDF

26.5 KB Created: 2011-11-21 10:02:00 +02:00 Authoring application: Hawaii.edu Pharmacy (via mPDF 5.0)

MD5: 1753473e6d4e29cb24998b61f2188cfa SHA-1: 3715c843f6b02eae50066d4e8eef28b517fb0aa0 SHA-256: d7ef7626b2a161c6a82428f827a709a192263185a746c81a619cf4329edf09de

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

Static analysis identified embedded JavaScript within the PDF document, flagged by multiple heuristics including ML classification and JavaScript stream detection. The JavaScript stream, named 'javascript_obj0020_000.js', is obfuscated and likely responsible for downloading and executing a secondary payload. The presence of unescape() calls further indicates obfuscation techniques commonly used to hide malicious code execution. The ML classifier's high score strongly suggests malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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_obj0020_000.js` `52fda692b07c9aa4efbf58a71a700ecc18f276e70eb54dbe1306b0814a6b382b`	pdf-javascript-stream	PDF /JS object 20 at offset 0x631D	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_002_off00000da8.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xDA8	17756 bytes
`font_01_sfnt_off00003bba.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3BBA	17892 bytes

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