PDF malware analysis — malicious · 9070d80f6d9d1815

MALICIOUS

PDF

46.6 KB

MD5: b6661a3b13740ac27042e1871eaefc8c SHA-1: 0ab8c52fe5d6cb6bb087ebadfe2300367632df90 SHA-256: 9070d80f6d9d181547499f661a7d8f6d6981e3c1a1dd2d58ed743114d9101570

116 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for malicious scripts. Heuristics indicate the presence of risky executable scripts within the XFA form, and an embedded script payload. The ML classifier strongly flags this PDF as malicious. The embedded artifact 'embedded_file_obj0011.bin' is likely the delivered payload.

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 script payload in PDF stream medium 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.
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.
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.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xD7	84 bytes
`embedded_file_obj0009.bin` `36ed59fe7a58a424647b80bfc4cee62cf94138543192781497de2441561ae8cf`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x16F	625 bytes
`embedded_file_obj0010.bin` `180440ec572e7d4f7249b98eb987c5a03a0a4c3a08467a9b14c0e3e066fc1172`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x425	96 bytes
`embedded_file_obj0011.bin` `93402b9dae456ebdc37d6ccfce64761c4c9820c956d7db84d7bbfd91d935e075`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x4CA	497 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 0x700	153 bytes
`embedded_file_obj0014.bin` `9d22faa0024595892c003f0511d84786cf327edc55698a33fb7fe6659c5d9e65`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x7E0	44978 bytes
`embedded_file_obj0015.bin` `6f0c029b6d16ee8c8a055ce3c9de61abb4666ed853aba10079b3dc0c4a5f3999`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xB7D6	67 bytes

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