PDF malware analysis — malicious · 98f98346903ea164

MALICIOUS

PDF

23.2 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: bf9d1f316271841550e94e2d59adc057 SHA-1: 21a402d8dde264dd68f3df1cbb2b1cac6ccbf378 SHA-256: 98f98346903ea164397bc9b5eeeb205a2914babe5705e3dd990e605510281d18

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains multiple high-severity heuristic firings, including PDF_EVAL, PDF_EMBEDDED_SCRIPT_PAYLOAD, and PDF_XFA_SCRIPT, indicating the presence of executable script content within the document. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded script is likely responsible for downloading and executing a second-stage payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'ML_NYX_PDF_MALICIOUS' heuristics. The specific ClamAV detection name 'Pdf.Exploit.Agent-36962' is included as a primary IOC.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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 0x3989	85 bytes
`embedded_file_obj0042.bin` `b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x3A3B	1183 bytes
`embedded_file_obj0043.bin` `31a7e179295d53a52ba690c5482cae457a4ff94ebdbb353a313bc09b352487eb`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x3C8B	1709 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 0x4031	144 bytes
`embedded_file_obj0045.bin` `ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x40F3	2427 bytes
`font_00_cff_off000044c3.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0x44C3	1192 bytes

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