PDF malware analysis — malicious · a8fc95e285a37c4c

MALICIOUS

PDF

52.3 KB Created: 2011-04-13 23:18:18 +03:00 Authoring application: Wiki Parent Plus Loan Consolidation (via mPDF 5.0)

MD5: b8c9da515eba667aadb7fea1eab8364d SHA-1: 1136dee15d7127e025bd881c120dcfc076cfad31 SHA-256: a8fc95e285a37c4c1ea3eaea5d86538b3e984d361fdc9cba9919e117d361076a

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness, and the presence of JavaScript with 'unescape()' calls and obfuscation indicators points to an attempt to hide malicious code. The extracted JavaScript files are the primary indicators of malicious activity, likely serving to download and execute additional payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9936

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 36 at offset 0xC940	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).
`javascript_obj0036_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 36 at offset 0xC940	134 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).

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