PDF malware analysis — malicious · cea8f26e585b0b63

MALICIOUS

PDF

46.4 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: fc7444fd550ceab1d8cbad4b5fa94b00 SHA-1: d40ccce70604f7e90f3db0f4edf113f698208743 SHA-256: cea8f26e585b0b6341fd77f83eded31f5926c87cd67c8b50cfed84cac0cfcba5

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF sample was flagged as malicious by multiple heuristics, including PDF_EVAL and PDF_XFA_SCRIPT, indicating the presence of executable script within an XFA form. The ML classifier also assigned a high probability of maliciousness. The primary attack vector appears to be the exploitation of a PDF vulnerability to run embedded JavaScript, which is likely responsible for downloading and executing a secondary payload. The ClamAV detection name 'Pdf.Exploit.Agent-36962' further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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 7

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 0x9494	85 bytes
`embedded_file_obj0042.bin` `b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x9546	1183 bytes
`embedded_file_obj0043.bin` `0172d45f3d1035ca3ba6e3fe5fad98320fb0ad948dffb51ff0f39033d17ec2f6`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x9798	2826 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 0x9D16	144 bytes
`embedded_file_obj0045.bin` `ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x9DD8	2427 bytes
`font_00_cff_off0000355b.bin` `23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0`	pdf-font-stream	PDF embedded font (cff) at offset 0x355B	31178 bytes
`font_01_cff_off0000a1a8.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0xA1A8	1192 bytes

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