Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3c50284f23f6c2…

MALICIOUS

PDF

1.26 MB Created: 2010-07-29 10:47:57 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)
MD5: 03beadbe4ce69210a32c4f38e3494d3e SHA-1: bd63cd26892195d07c6ba616a7a7ce1e55ba9a3c SHA-256: fe3c50284f23f6c2482dc059af7ef444867951c3f4fdd4cf85c775fabc778e6a
66 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of unescape() and String.fromCharCode functions suggests obfuscation and potential exploitation of a vulnerability to execute arbitrary code. The extracted artifact 'javascript_obj0055_001.js' is likely the payload. The document body is largely unreadable binary data, providing no contextual clues for the attack's pretext.

Heuristics 6

  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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://pajhome.org.uk/crypt/md5
    • 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
13012d008f010937fa143ea3cb867f48d504772941a36db0ac73f852d9329885		 pdf-javascript-stream PDF /JS object 55 at offset 0x13DBAE 13145 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s).

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