PDF malware analysis — malicious · 5bd690c70fb35071

MALICIOUS

PDF

183.8 KB Created: 2004-09-21 08:31:57 -04:00 Authoring application: Adobe Designer 7.0

MD5: f5534541a221d69e55724b570e62aae9 SHA-1: a83be4bd98aecd7946a83205b941603a5dbf7302 SHA-256: 5bd690c70fb35071b2a785ec8edb9e646b9312a0134473cdbf5569bd753feca7

222 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document utilizes embedded JavaScript, including eval() calls and XFA forms, to execute malicious code. The script attempts to redirect the user to 'http://cgi.adobe.com/special/acrobat/update' by presenting a fake update prompt, likely to download a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9527

Heuristics 11

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.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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
Embedded script payload in PDF stream low 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.
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/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://cgi.adobe.com/special/acrobat/update
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.1/
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xtd/
- http://ns.adobe.com/xfdf/

Extracted artifacts 12

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0188.bin` `c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb`	pdf-embedded-file	PDF EmbeddedFile object 188 at offset 0x2A9FC	85 bytes
`embedded_file_obj0189.bin` `d7130124e21a7dcb5958432a23a5370668354cc0412b120f252a73e3304d17fb`	pdf-embedded-file	PDF EmbeddedFile object 189 at offset 0x2AAAF	1490 bytes
`embedded_file_obj0190.bin` `42c01c01f2b35522fe7669f4db44a307d38e3a768f61059abaed7946e9790221`	pdf-embedded-file	PDF EmbeddedFile object 190 at offset 0x2AD8C	24824 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`embedded_file_obj0191.bin` `1b986ca247d82649456825aa0a7d0439dbea634924b216fa0d6c072059e02101`	pdf-embedded-file	PDF EmbeddedFile object 191 at offset 0x2BCA4	316 bytes
`embedded_file_obj0192.bin` `57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f`	pdf-embedded-file	PDF EmbeddedFile object 192 at offset 0x2BDBB	212 bytes
`embedded_file_obj0193.bin` `e82f9d537010c5b3932becc11974f98af4f1923414fd7d176a8520f2d211e210`	pdf-embedded-file	PDF EmbeddedFile object 193 at offset 0x2BEB3	765 bytes
`embedded_file_obj0194.bin` `a60265344cf1a9e94da34c8f587f64a4297e2fa417c895852209903ab7588bcc`	pdf-embedded-file	PDF EmbeddedFile object 194 at offset 0x2C0A7	85 bytes
`javascript_obj0180_000.js` `aa92d846400e59fc3abaf6aa894b725d701cf695f8865309367ff82c0667999b`	pdf-javascript-stream	PDF /JS object 180 at offset 0x2A2AD	825 bytes
`javascript_obj0182_001.js` `322c66470a1cefe70312a92078de4a6c0d0d01cae2864ad2009cb588c9b46ec9`	pdf-javascript-stream	PDF /JS object 182 at offset 0x2A432	2674 bytes
`javascript_obj0184_002.js` `a683121ee7c84b6622d28073d5845477daf7eb3a0721f7af9e8a20da36ecf4bd`	pdf-javascript-stream	PDF /JS object 184 at offset 0x2A6F5	1543 bytes
`font_00_cff_off0000169e.bin` `96161e3d15cf67591ef2a1c87940c8dc0af59a94fcfab5d6bfcf4cb992a24af8`	pdf-font-stream	PDF embedded font (cff) at offset 0x169E	64586 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.45, consistent with packed or encrypted content.
`font_01_cff_off0000d47f.bin` `19bc268243419390efbe4d4a72616ba894a394856f2c9ca5fc68f8c8c3d28328`	pdf-font-stream	PDF embedded font (cff) at offset 0xD47F	67274 bytes

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