PDF malware analysis — malicious · 9cf042b0ec2dc0b3

MALICIOUS

PDF

587.3 KB Created: üÜF ¤)ÿ25ÿí¹fL Authoring application: ïI (via õGV_ÁFî,<h¨êÈ"ÂK¯R½^Kå=))

MD5: 45805a50bc7af9c6428f76723dfeea25 SHA-1: 6ed7d8bd9febba81b076ac46f81de5f218882d5e SHA-256: 9cf042b0ec2dc0b3a2d92c1987b8c0be15f0b7ea404323f00eb581a6f85221a7

368 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript and a launch action targeting cmd.exe, indicating an attempt to execute arbitrary code. The critical heuristic 'CVE_2010_1240' confirms this exploit vector. The embedded PE payload suggests the primary goal is to download and execute a secondary malicious file. The ClamAV detection also confirms its malicious nature.

Heuristics 10

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\\orig.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
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.

Filename	Kind	Source	Size
`javascript_obj0165_000.js` `151d9872cd4fc457e2ecaecb13fb24ddb49058e1f569a39bec6c02325a1e3424`	pdf-javascript-stream	PDF /JS object 165 at offset 0x9288E	53 bytes
`stream_001_off00087c5b.bin` `fce317a664f60aafaaf2d5f9b4568251bb59db13274ff7cc298ea3defab2b845`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x87C5B	73802 bytes

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