Malicious PDF — malware analysis report

Static analysis result for SHA-256 13794c62b68605a0…

MALICIOUS

PDF

46.6 KB
MD5: 4ad1d6005adb42b0764f6ecff48a9f13 SHA-1: ce40acaea703be323ef14d18283c44f714671306 SHA-256: 13794c62b68605a0ea6590fdac4bbc139ff118a2c03a785a66796dcac64e25a5
106 Risk Score

Malware Insights

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

The PDF file contains an XFA form with executable script, flagged by multiple high-severity heuristics. The script is likely designed to download and execute a secondary payload, as indicated by the embedded file artifact 'embedded_file_obj0011.bin'. The ML classifier strongly indicates maliciousness, and the overall behavior points to a typical malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 84 bytes
embedded_file_obj0009.bin
e067103765d3d4436c257d5836db0748242078e1813978971001c5187529174d		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x16F 631 bytes
embedded_file_obj0010.bin
2753a8e35605d15c1270906551fcd62cb1e5e88ac2b382451895ce1fbe2af194		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x42B 97 bytes
embedded_file_obj0011.bin
419977060e4f746665e19e625f310b5dd4b7f7913ac7fd1ceb29418fe62a6c56		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4D1 498 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0012.bin
9a3d5b61e8cc421ddfd7e83b56ed2c3a3a4b566c7df6acfd14e675c598f13083		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x708 153 bytes
embedded_file_obj0014.bin
05b0437edef473443aa1701adf1450923f93174795a5f1ef06671022f640a050		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7E8 44991 bytes
embedded_file_obj0015.bin
6f0c029b6d16ee8c8a055ce3c9de61abb4666ed853aba10079b3dc0c4a5f3999		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xB7EB 67 bytes

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