PDF malware analysis — malicious · 8730728efcd9c71c

MALICIOUS

PDF

46.5 KB

MD5: d644c49354f09aca0b6307647b120131 SHA-1: e5de70dc230d56fcbac12756b3414ed7f8986a7d SHA-256: 8730728efcd9c71c283ab2f7de9d80f3ed0a5250b5355e4858ac0c5633a4a6f1

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded executable scripts, indicated by high-severity heuristics like PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD. The ML classifier also strongly flagged this PDF as malicious. The embedded scripts are likely designed to download and execute a second-stage payload, as suggested by the extraction of an embedded file artifact named 'embedded_file_obj0011.bin'. The document body content appears to be obfuscated script fragments rather than user-readable text.

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` `55c66f2324e6b90c55cc4a7400bbdc1d0ecdd9c4d039cf21188e1e9fb6b2c4a0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x16F	622 bytes
`embedded_file_obj0010.bin` `72b2686c6b7eee3f37ec27ac0aa30cfc332e88c80e95149f9bc4732b76c19fab`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x422	95 bytes
`embedded_file_obj0011.bin` `fd1c0b3c4042c3e8530266be3a59e3a9c953f87c37423482a117a8c5430ecda5`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x4C6	493 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 0x6F8	153 bytes
`embedded_file_obj0014.bin` `c9db9788ddc7975064d48615123fd43b8116ba479c02c531f284b6a8791b0506`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x7D8	44933 bytes
`embedded_file_obj0015.bin` `6f0c029b6d16ee8c8a055ce3c9de61abb4666ed853aba10079b3dc0c4a5f3999`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xB7A1	67 bytes

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