PDF malware analysis — malicious · 4ae16f84ab396bb1

MALICIOUS

PDF

23.0 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: 17b4ba2242f7372375f6cc41e019f769 SHA-1: ea80e7b56a3df86fcaa5d32014ac3f4ca83b034e SHA-256: 4ae16f84ab396bb1650d1e9a3813205e31aefee4c2d3b84362b436b8fed917c7

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

This PDF document exhibits malicious behavior through the use of XFA forms and embedded scripts, as indicated by high-severity heuristic firings such as PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD. The ML classifier and ClamAV detection strongly suggest a malicious exploit. The presence of an embedded file with suspicious script obfuscation indicators further supports this assessment. The primary attack vector appears to be exploiting PDF vulnerabilities to execute arbitrary code.

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 0x38BF	85 bytes
`embedded_file_obj0042.bin` `b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x3971	1183 bytes
`embedded_file_obj0043.bin` `31a7e179295d53a52ba690c5482cae457a4ff94ebdbb353a313bc09b352487eb`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x3BC1	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 0x3F67	144 bytes
`embedded_file_obj0045.bin` `ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x4029	2427 bytes
`font_00_cff_off000043f9.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0x43F9	1192 bytes

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