PDF malware analysis — malicious · 55f90cc4f4af687f

MALICIOUS

PDF

88.2 KB Created: 2010-08-03 10:00:10 Authoring application: libgnomeprint Ver: 2.18.5

MD5: a4da01e5b1dfde948ed6ba07e4f1b4a4 SHA-1: bf5d9d0f181f9303af4e8cea16ed0c28fc83ef6f SHA-256: 55f90cc4f4af687fd4afe8619b320c6b1bc704fcfe549d38fd9e5668d0303d33

484 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1204.002 Malicious File Execution: User Execution T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566 Phishing T1566.002 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript and a Windows executable payload disguised as a PDF. The critical heuristic CVE_2010_1240 indicates a launch action targeting cmd.exe, which is designed to execute the embedded payload. The embedded executable was detected by ClamAV as Win.Trojan.Swrort-5710536-0, and the PDF itself was detected as Pdf.Tool.Agent-1388586. The attack pattern involves luring the user to open a malicious PDF that, when opened, executes 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\\zapytanie.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.
ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
/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 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`zapytanie.pdf` `f014b3aeca34b4ce2b609c8862fd6f8c0622c40de03a9ad180cdf8ed1cd19abe`	pdf-embedded-file	PDF EmbeddedFile object 26 at offset 0xB02E	73802 bytes
Detection ClamAV: Win.Trojan.Swrort-5710536-0 Obfuscation or payload: unlikely
`javascript_obj0027_000.js` `261f55b262c14beb62c13a5c38d0a479cad84b4658261837f35580baca591471`	pdf-javascript-stream	PDF /JS object 27 at offset 0x15CD0	58 bytes
`font_00_sfnt_off00003d41.bin` `73f30e29ccda72134f5a16fa9b3832648b957d5ea17da371d1e38d09a1c0d477`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3D41	24804 bytes

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