Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbe1061b556359e…

MALICIOUS

PDF

339.4 KB Created: 2010-08-06 13:39:53 Authoring application: Microsoft® Office Word 2007
MD5: 44f980e56598f4600ee0271aade16449 SHA-1: 7ba9776563ae15839b47437a3873dba4fc085dae SHA-256: 1bbe1061b556359ec3d7affd1bace8a2ffbebe1fdeae47e9d70d60ddacdf0eb8
412 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 critical PDF_LAUNCH heuristic firing, indicating an attempt to execute cmd.exe. This is further supported by the PDF_EMBEDDED_PE_PAYLOAD heuristic, which identified an embedded Windows executable. The CVE_2010_1240 heuristic confirms the exploit targets a known Adobe Reader vulnerability for command execution. The embedded executable is likely a second-stage payload, and the mailto URI suggests a potential phishing or social engineering vector.

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.
  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • 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\\Comunidad_Valenciana2.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
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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
  • External URI low PDF_URI
    PDF contains an external URL action

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0189_000.js
439691fcba3f127d2724a3adfb9f387fc561cc78c26b5c60bb688f2cbcca27c3
pdf-javascript-stream PDF /JS object 189 at offset 0x5488C 70 bytes
stream_008_off0000d74f.bin
734b945b274d84d405d6f2494dca31579ee1308dc3bfac2968b06562f5fe86ac
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD74F 185880 bytes
stream_010_off00024114.bin
d9351745ca0d87e1b119e5d8965532bfeb23e784668d15a7dd6faadc0ea30f95
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24114 302228 bytes