Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa41919515971fe…

MALICIOUS

PDF

119.6 KB
MD5: 0d8ab082366a484fc813ed8d6f51d9cb SHA-1: f89820c7f51a0a291cf05e8b3b906ea21b671078 SHA-256: 0fa41919515971fe0c5bd70c4d90dbcc9fdb1985f3a50680eb4e33a797234e84
166 Risk Score

Malware Insights

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

The PDF file exhibits multiple high-severity heuristics indicating JavaScript-based exploitation, specifically within an XFA form. The embedded JavaScript stream, while obfuscated, is designed to execute malicious code. This suggests the document is intended to exploit vulnerabilities or trick the user into executing a payload, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). 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.
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/
    • http://www.xfa.org/schema/xfa-locale-set/2.7/
    • http://www.xfa.org/schema/xfa-locale-set/2.6/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0027_000.js
80d7888ecf9ad9e4d03cd8cc6959f589c8f8783f37d48bb4d7dae53f6684c595		 pdf-javascript-stream PDF /JS object 27 at offset 0x1C0B 8603 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_001_off00000b76.js
672d461752be4a970c8e9721164ce074d252b55d09d46cc09259d2ce4fc09f7f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB76 1546 bytes
stream_002_off00000e2f.bin
29cf1edfedd4f27f3c450646c5dc2510e6bf9e63eee1cd436ac517a465a2e1bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE2F 1650 bytes
stream_003_off0000119b.bin
0f910ffeec733940f6ba1ae41dc6770eab5d615c05bccc95197878b62c8dc45f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119B 2928 bytes
stream_005_off00001728.bin
4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1728 56 bytes
stream_006_off000017ac.bin
fe122a09d8a0444608fdc5a6f4981a2dbd469f5bbfacb4bdd327c28ccc343e13		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17AC 149 bytes
font_00_cff_off000051e4.bin
ea8f409c7366ed46eeb553aa7b404f04641f482ba88463fbe253da60be5787e5		 pdf-font-stream PDF embedded font (cff) at offset 0x51E4 1138 bytes
font_01_sfnt_off000058c3.bin
e31f8c8507e52f29008d946a00becde9f839e34cb108985ce66167bf881adafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C3 8084 bytes
javascript_obj0029_000.js
0db1174c0d98d9cc0f34baf7abc6ca0d4fa889dfcd71f63d2ee508b82bf4899b		 pdf-javascript-stream PDF /JS object 29 at offset 0x1E2A 8603 bytes

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