Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b895e04f71ecc30…

MALICIOUS

PDF

674.1 KB Created: ‘Š¡ÁŖ¤/žFrí¤$¢Í­ø 1f Authoring application: ÈÊþ“—Ò³Lê2 ¹öráÆ¨åg.óPòæ©ö (via ÈÊþ“—Ò³XÇ5±ñ{ö”½þ !iÖËí´å´-)
MD5: c78cd9cdf769b710ba4d19da1bd4aa52 SHA-1: b23b504f5cb855b56e0e3299d9a7d8be7f153c1b SHA-256: 3b895e04f71ecc3019c1dd30e4fb07d4abb19281963428df79fd530d68a5c07e
396 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1055.012 Process Injection

The PDF contains JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. The critical heuristic CVE_2010_1240 confirms this exploitability. Additionally, an embedded PE payload was detected, suggesting the PDF acts as a dropper for further malicious activity. The ClamAV detection further supports the malicious nature of the file.

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 (if exist "%HOMEPATH%\\My Documents\\AramaMotoruTaktikleri.pdf" (cd "%HOMEPATH%\\My Documents"' — 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 /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). 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.
  • PDF paints image(s) but contains no text operators medium PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • 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_obj1493_000.js
a8c4af2275fdb19987cd10bcebf46e0b3c63433a8ed459ebfa4470e308530e8a
pdf-javascript-stream PDF /JS object 1493 at offset 0xA8123 70 bytes
stream_000_off000a19af.bin
191b358badf4ef4f4f08b79b77f98a75346b5c671a3dde56966a54c4e643b803
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA19AF 106565 bytes