PDF malware analysis — malicious · 1699e5165d1d2421

MALICIOUS

PDF

20.9 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: 430be8b9bb37cdf35bd48f5308644c68 SHA-1: 6bf50fbf4beaf8b333497e84deb000f8894d35bd SHA-256: 1699e5165d1d2421c1600e2613b1e5fb0eb86dad00c9fbbe488bd751dc4506fa

266 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains high-severity heuristics indicating an embedded exploit and XFA form with executable script. ClamAV detections confirm it as a malicious PDF exploit, likely dropping a second-stage payload. The embedded script uses eval() and String.fromCharCode, typical for obfuscation and payload execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.Dropped-81 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xD7	67 bytes
`embedded_file_obj0009.bin` `51a31f8558983c35fe5e038fb41aebaca8b406725509607307dd3926e5e2d540`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x162	781 bytes
`embedded_file_obj0010.bin` `c71f7bd5f8cfd3d96d0f285ff85e50c0dc94d73f0c5a4ba37eb6fd71317112a5`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x4BA	122 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `c4694b9033453a8835223e7848af9e06f9d62d27ad5f4c88b9dc8d4234e5f14c`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x57F	18289 bytes
`embedded_file_obj0012.bin` `6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x4D3B	389 bytes
`embedded_file_obj0014.bin` `5de4882c2ac3997ab05c26a9217ff59fa937baaa4c7c1e950171498dedd65b30`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4F0A	95 bytes
Detection ClamAV: Pdf.Exploit.Agent-36836 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0015.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x4FAF	77 bytes
`embedded_file_obj0016.bin` `78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x5043	68 bytes

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