Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e86e3b583f3ab2…

MALICIOUS

PDF

70.1 KB
MD5: 54744dfc3a3d76c840ffed0906bb260f SHA-1: a1b022d2624c98e9b72a48fafae39ff4b67654c6 SHA-256: a7e86e3b583f3ab269f87632672651ca7d6a9963525c6f9811a9c96532fd08cd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests obfuscation is being used to hide malicious code. The embedded JavaScript stream, javascript_obj0013_000.js, is the primary artifact of interest. While the document body is largely unreadable garbage, the presence of JavaScript and the unescape function strongly suggest an attempt to exploit PDF vulnerabilities to download and execute a secondary payload. The URL http://www.bitstream.com is also present, though its reputation is unknown.

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.bitstream.com
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
3f9fe708e7feb11e93d81b9b165f0f97f29715006f2f133f0fb445bf697a9e10		 pdf-javascript-stream PDF /JS object 13 at offset 0x10531 3967 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
font_00_sfnt_off00000352.bin
a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x352 65932 bytes

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