Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8b9b7d304ca4d6…

MALICIOUS

PDF

309.5 KB Created: 2026-03-18 02:38:37 +07:00 Authoring application: Microsoft® Word 2010 First seen: 2026-05-16
MD5: e636293b2baf9cbdff7ef8c7d92d8002 SHA-1: 99ff9b99cc2cf30ae2d24a0cd4763df8d08145ca SHA-256: 5d8b9b7d304ca4d6b565dcab34646da629f3bf98aaf3c18de12d247c2738b699
576 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • 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\\Resume.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.
  • Suspicious extracted artifact critical 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.
  • /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 1 related finding 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
  • 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.zeustech.net/ Referenced by PDF JavaScript
    • http://]hostname[:port]/pathIn extracted file (Resume.pdf)
    • tcp://94.156.250.190:3884In extracted file (Resume.pdf)
    • http://www.apache.org/Referenced by PDF JavaScript
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0XIn extracted file (stream_017_off000328d1.bin)
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0In extracted file (stream_017_off000328d1.bin)
    • http://www.microsoft.com/pkiops/crl/MicCodSigPCA2011_2011-07-08.crl0aIn extracted file (stream_017_off000328d1.bin)
    • http://www.microsoft.com/pkiops/certs/MicCodSigPCA2011_2011-07-08.crt0In extracted file (stream_017_off000328d1.bin)
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0TIn extracted file (stream_017_off000328d1.bin)
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0In extracted file (stream_017_off000328d1.bin)
    • http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl0^In extracted file (stream_017_off000328d1.bin)
    • http://www.microsoft.com/pki/certs/MicRooCerAut2011_2011_03_22.crt0��In extracted file (stream_017_off000328d1.bin)
    • http://www.microsoft.com/pkiops/docs/primarycps.htm0@In extracted file (stream_017_off000328d1.bin)
    • http://www.microsoft.com/TypographyIn extracted file (stream_017_off000328d1.bin)
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (font_00_sfnt_off00009e31.bin)
    • http://www.microsoft.com/typography/fonts/In extracted file (font_02_sfnt_off0002daa2.bin)
    • http://www.monotype.com/html/mtname/ms_symbol.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlMicrosoftIn extracted file (font_05_sfnt_off0003d0b5.bin)
    • http://www.monotype.com/html/type/license.htmlIn extracted file (font_05_sfnt_off0003d0b5.bin)
    • http://www.microsoft.com/Typography/0In extracted file (font_05_sfnt_off0003d0b5.bin)

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
Resume.pdf pdf-embedded-file PDF EmbeddedFile object 324 at offset 0x42336 73802 bytes
SHA-256: 6a50685eeab6adeb2348035aa408f2025fd69f8fe56ef3d3f402a0140b716ba8
Detection
ClamAV: Win.Trojan.Swrort-5710536-0
Obfuscation or payload: likely
actual_type=PE; declared_or_context_type=PDF; filename=Resume.pdf; kind=pdf-embedded-file Static shellcode analysis recovered the Metasploit stager connect-back address: 94.156.250.190:3884 (reverse/x86, public) Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, SC_PUSH_STRING, SC_STR_GETPROCADDRESS Static shellcode analysis recovered API/import strings: kernel32.dll, advapi32.dll, KERNEL32.DLL, ADVAPI32.DLL, LoadLibraryA, GetProcAddress
javascript_obj0325_000.js pdf-javascript-stream PDF /JS object 325 at offset 0x4CFDB 55 bytes
SHA-256: df4d9594c2c8e0b11b842a092beeb1e82b33667b8cf8ac2293922ed84ca2d2f7
Preview script
First 1,000 lines of the extracted script
this.exportDataObject({ cName: "Resume", nLaunch: 0 });
stream_017_off000328d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328D1 57944 bytes
SHA-256: 430a6230c9fed0a0950fe655e77207c3c42bf7bb179fd106cb3e77db3c6a0cda
font_00_sfnt_off00009e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E31 344164 bytes
SHA-256: de65c2ba0ec052db1e7931a4d928d6140348445144693a79871f2ece269d7e5b
font_01_sfnt_off0001b111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B111 359868 bytes
SHA-256: 7f9d5ff811d9ee4fe0cd9c9c5803a998588318ff5eefdc0221a9c49846a01bb2
font_02_sfnt_off0002daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DAA2 59296 bytes
SHA-256: e641387f5fd18b5ca6056b97b70c809d3bcf0c56a9dd5a3ffb1ff9e3112848e4
font_04_sfnt_off000381f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x381F5 53148 bytes
SHA-256: 2f2ab3177a18da6fb1459fc73afbcf5f1be4e385df014d21c8baaf339a09888c
font_05_sfnt_off0003d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D0B5 25228 bytes
SHA-256: b1c2362109b3c1555dd5946549cada931b8066060cb7036e6b0b500de41c44e8