Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f10b150dafb5a4…

MALICIOUS

PDF

45.7 KB
MD5: 8f038115d0664fbb78ce5367302e4577 SHA-1: 5e3f41eafb93e77c3d24d2f1b9168e65ef133238 SHA-256: 03f10b150dafb5a4b6837a830390532e006711e64f3de3185d9b213afe40e3cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged as a critical exploit cluster and associated with XFA forms. This JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to execute a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of an embedded URL suggests a download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
39c0f7badeaec63dd00a9ac761a68415871f19a477ff56911f52892fcad6b8ee		 pdf-javascript-stream PDF /JS object 6 at offset 0x24F 3966 bytes
stream_000_off00000150.bin
0198ac29b66dd54fcf58a4db93eeae62238daa40196c6da89083f45535c30cf3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x150 436 bytes
font_00_sfnt_off00000a85.bin
eff8d61ee7c6c431b17d732bf7b0cdaf14ec3dd997fa3013b0e89fa4fcb85274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA85 65932 bytes

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