Malicious PDF — malware analysis report

Static analysis result for SHA-256 43081ef6c99b1a9b…

MALICIOUS

PDF

1.24 MB Created: 2010-07-29 10:37:17 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)
MD5: da9ca6077aa51b32117a1f557b3202f3 SHA-1: fc7b466a7ada0f7b792ef1eb2069758cda8b89dd SHA-256: 43081ef6c99b1a9b140374b395e21132abf0911ad8d2d7729f50b514d48ab150
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The unescape() function call is a common technique for obfuscating malicious JavaScript. While no specific URLs were flagged as malicious, the presence of obfuscated JavaScript within a PDF points to an attempt to deliver a malicious payload, likely by exploiting a PDF reader vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 5

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • Suspicious extracted artifact info 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.monotype.comMonotype
    • http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlhttp://www.monotype.com/html/type/license.html
    • https://www.verisign.com/rpa
    • http://ocsp.verisign.com/ocsp/status0
    • https://www.verisign.com/rpa0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
    • http://www.microsoft.com/typography
    • http://www.iec.ch

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0055_001.js
e0fd4172f27102e2c2e70b1b926a8013efbdc338abe0556f151bd78a6cd44169		 pdf-javascript-stream PDF /JS object 55 at offset 0x13DBAE 1140 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.