PDF malware analysis — malicious · f3f342c03a9425b6

MALICIOUS

PDF

114.8 KB

MD5: 0d17357c952bce58be1423a712e1ec98 SHA-1: 179f86fab742b1d61ae7084a071c24a034069cf8 SHA-256: f3f342c03a9425b667b42821c0213354dd59824bebfe4d15d3d854e1963ad3e7

514 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 User Execution: Malicious Link T1027 Obfuscated Files or Information

The PDF contains JavaScript that triggers a launch action, executing cmd.exe. This command is used to execute an embedded Windows executable disguised as 'fiche.pdf'. The embedded executable was detected by ClamAV as 'Win.Trojan.MSShellcode-7', and the PDF itself was flagged as 'Pdf.Tool.Agent-1388586'. The primary attack vector involves tricking the user into opening the disguised executable, which then likely proceeds to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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\\fiche.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 11

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`fiche.pdf` `a16eed3a6030d9fd6f75d18ee71c0f85f3f7238bbb6f5bb22c9ba2232a68f6d1`	pdf-embedded-file	PDF EmbeddedFile object 70 at offset 0x11A6A	73802 bytes
Detection ClamAV: Win.Trojan.MSShellcode-7 Obfuscation or payload: unlikely
`javascript_obj0071_000.js` `f9dba7886c44de0c8a50df86a832379c8d6343df7d6ab5ecc5950fb1c392f110`	pdf-javascript-stream	PDF /JS object 71 at offset 0x1C714	54 bytes
`icc_00_off00003fd5.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x3FD5	3144 bytes
`icc_01_off00004aab.icc` `61cfd900e5194258adf98bcb3d44311afa42d9c0372d2050ffd9e6975a4d069c`	pdf-icc-profile	PDF ICC profile at offset 0x4AAB	2036 bytes
`icc_02_off00004fa7.icc` `0fb37c4328cacebb547210723e15a9fe040ef5a17e5b496e993ca68db0126a88`	pdf-icc-profile	PDF ICC profile at offset 0x4FA7	2008 bytes
`font_00_sfnt_off000057d6.bin` `c78989a39e084c41c90c53241bcaf5cd50189902472be290818e9e8e900e3ced`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x57D6	12488 bytes
`font_01_sfnt_off000074af.bin` `0b07bd34e8c46e01a77719b65de93d092eeb040ce587cf72ff5967f7d93ddb3d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x74AF	11256 bytes
`font_02_sfnt_off00009227.bin` `95a1a63bb1c056b2c8ecdc68a7209dd3f9a566494a98e2b5ec63f2f7b3e0fef4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9227	15988 bytes
`font_03_sfnt_off0000be7c.bin` `ac1efaaa2671d1753e3096a93c10ebad68cbe98153922cd9e87999c7e37951b8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE7C	5468 bytes
`font_04_sfnt_off0000cd80.bin` `11500a68480e170167444eef89ccc470dc43feb7e1051d64b83381581557bf2d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD80	20744 bytes
`font_05_sfnt_off00010735.bin` `85e8776995a5d9d6f3c2d58554827a13b01c6d8d8cfd5e936929c5faa2b79c90`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10735	5060 bytes

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