PDF malware analysis — malicious · 3143ad9e1318616a

MALICIOUS

PDF

501.7 KB Created: 2009-12-07 10:05:28 +03:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))

MD5: eba9effacf4933f8f7cc88af4371edc5 SHA-1: 691b82ba902717dc7ab7afb6974a9679c99915e2 SHA-256: 3143ad9e1318616a0be90db2372831ff606e950f829707f874872c8cb2971157

456 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The PDF file contains a JavaScript action that triggers a launch action, exploiting CVE-2010-1240 to execute cmd.exe. This command is used to potentially drop and execute an embedded Windows executable disguised as 'APPLICATION1.pdf'. The embedded payload was identified as a Windows executable, and the ML classifier strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 12

Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240

PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\APPLICATION1.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH

An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
/Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS

PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
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
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/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`APPLICATION1.pdf` `c0d64481fab02105c686fd95b33f08b608182f9eeb2a24374148645957459949`	pdf-embedded-file	PDF EmbeddedFile object 61 at offset 0x37839	311296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.64, consistent with packed or encrypted content.
`javascript_obj0062_000.js` `8f9a82b35c46fd3f2cd611795d458ec6ee727f5f02b47e956f8d01678c52acba`	pdf-javascript-stream	PDF /JS object 62 at offset 0x7D13E	61 bytes
`stream_019_off00026214.bin` `22d50de66b0039afa5503038fbcf062142af29fad0c066df4c67a959fd1e6c1b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x26214	47268 bytes
`icc_00_off0000903a.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x903A	3144 bytes
`font_00_sfnt_off0000e81f.bin` `afa1ef5dbadf7c876ac0d3c65a930484bcbc987184ad535c7671ee34394ae45f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE81F	42644 bytes
`font_01_sfnt_off00019fc7.bin` `891ad953b985317bd9bef7ec2441ccdd5cce77bc59e5fc0557b1b61ba5e02fd7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19FC7	46240 bytes
`font_03_sfnt_off0002c715.bin` `e47091b477b0eca5aaa0c969024c92a1cd9d038c6f1bfdf9a0129addf7dae51f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2C715	37424 bytes
`font_04_sfnt_off0003156f.bin` `1ea3340d7efdfb7f33dcec7af984e7c5e83f16f3742ee2ef578a66954ba710af`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3156F	37508 bytes

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