Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13fa6dc419d2c05…

MALICIOUS

PDF

93.7 KB Created: ¥Ý+R«œðMÚp±Ú`§IÒ¼“› Authoring application: ­UT½4“¶F0vÂڅБu.}|>L”`­ì¬Â½ (via ɝtþØé8ƒG6ì†8öØYÖµ“”BΧ>e'P)
MD5: cb1d443676c97a83344c6edcb49da537 SHA-1: d56b353eeb80686ed961216001b5cdcac6a0649d SHA-256: b13fa6dc419d2c05a87df4a1fcb417c36cb7c5402e05998e9e6581320fd309d3
376 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary code. The critical heuristic CVE_2010_1240 confirms this, noting a chain involving an embedded executable payload. The ClamAV detection further supports its malicious nature. The primary attack vector appears to be exploiting a PDF reader vulnerability to download and execute a secondary payload.

Heuristics 11

  • 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\\Report.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0536_000.js
ddae86274602ebcd16a9bdd1e7f0aae016e1337d7867313b8ce221ca79ec2d82		 pdf-javascript-stream PDF /JS object 536 at offset 0x17102 55 bytes
stream_002_off00012416.bin
5124a034fe30f96cfa22c6b6a6b6707b50f57ef49385d93dd836e21294f5679c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12416 37888 bytes

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