PDF malware analysis — malicious · e03dfbf2d191865d

MALICIOUS

PDF

23.7 KB Authoring application: 52-164-161-159-117-154-147-164-117-161-150-151-90-145-123-105-144-145-123-106-91-109-175-164-151-166-167-164-160-82-145-123-103-175-152-167-160-149-166-155-161-160-82-145-123-107-90-145-123-104-91-173 (via 1-154-119-162-107-152-161-116-125-97-97-97-97-97-169-115-115-115-115-116-115-115-115-115-115-115-115-115-115-115-115-115-131-115-115-115-115-115-115-115-115-139-170-117-115-133-155-115-153-139-115-97-)

MD5: 2bad7b9d94d7cead86baf14322990d7f SHA-1: dacbe897b8b3233624548b903bc16b1e3cc77f83 SHA-256: e03dfbf2d191865dbe41e1fa90ebb7ce66bf631183b00307bf2dcd16b1f7ab9c

226 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1204.002 Malicious File Execution: User Execution: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF sample exhibits high-confidence maliciousness due to multiple heuristic firings, including PDF_EVAL and PDF_XFA_SCRIPT, indicating the presence of executable script content. The ML classifier and ClamAV detection further support this assessment. The primary attack vector appears to be an embedded XFA form containing risky executable script, which is designed to exploit PDF vulnerabilities and likely download a secondary payload. The ClamAV detection name 'Pdf.Exploit.Agent-36962' is the most specific IOC available.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 10

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.
ClamAV: Pdf.Exploit.Agent-36962 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36962
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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. (matched inside decoded stream)
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x3986	85 bytes
`embedded_file_obj0042.bin` `b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x3A38	1183 bytes
`embedded_file_obj0043.bin` `32c60bc0f4bacee1896e4ec3a76b86900125f2860b8c1f33f6f4f5c53d0ce625`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x3C8A	2785 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`embedded_file_obj0044.bin` `3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169`	pdf-embedded-file	PDF EmbeddedFile object 44 at offset 0x4220	144 bytes
`embedded_file_obj0045.bin` `ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x42E2	2427 bytes
`font_00_cff_off000046b2.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0x46B2	1192 bytes

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