PDF malware analysis — malicious · 71f76c890e571fca

MALICIOUS

PDF

6.9 KB Created: 2010-05-15 14:19:32 Authoring application: oldNameValueWL

MD5: 2e63f0b70fa687522841f14c2a1c41c1 SHA-1: 3e329e8695d794bf38ddb21ede8bad3262098a68 SHA-256: 71f76c890e571fca14ee18fb0bdae9f0fde093648b2a1a94baae360449814d67

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains high-severity heuristics indicating the presence of executable JavaScript and an embedded file payload. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is likely designed to download and execute a secondary payload from one of the embedded files, such as embedded_file_obj0012.bin.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://ns.adobe.com/xtd/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `60c44d2a01c1b5489c0f813b48ea85c70dc7668c45398215de47be66bc057c5f`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x222	84 bytes
`embedded_file_obj0009.bin` `6f0947ea838e32f7f02d109e1412ce71f5a213f84bd24687c3878fd8526715ce`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x2D3	242 bytes
`embedded_file_obj0010.bin` `58d6a4173ddbe116f29066055079c1240d1773c92f9940363c704af39c9fc688`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3CE	1169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `f295076dbe9c477728c7b64312111f6767a8a82bc198537f194435952ec884be`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x64C	219 bytes
`embedded_file_obj0012.bin` `168f3fbc2cbcfd2633d4829d937a4e043dc18d829b7c5fbe218cf12ce7b0dabd`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x744	58817 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x16C9	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1771	56 bytes

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