PDF malware analysis — malicious · 9a5a9689d0c2d57b

MALICIOUS

PDF

26.1 KB Created: 2011-01-24 17:02:50 +02:00 Authoring application: Us Bank Home Loans (via mPDF 5.0)

MD5: 7cf526bb14fcdbb44dd0d94d5fb4e0d6 SHA-1: a40b604f750a7e6de9ac64b4a86e688ce17cbfc1 SHA-256: 9a5a9689d0c2d57b26a1bda2983a2cf722c8dd4215c94b0ad65b562d4d6a306f

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic and suspicious artifact signals suggest obfuscation within these scripts. The primary function of these scripts appears to be the execution of malicious code, likely for downloading and executing a second-stage payload. The document body was unreadable, so the rationale is based solely on the script analysis.

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_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x611E	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_obj0020_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 20 at offset 0x611E	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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