PDF malware analysis — malicious · 03312318129bfceb

MALICIOUS

PDF

82.5 KB Created: 2010-02-07 22:10:13 +01:00 Authoring application: LaTeX with hyperref package (via xdvipdfmx (0.6))

MD5: a1dda9fd56ac066007b18e22d9a3fa92 SHA-1: 24219043aed654d04bb2b6c1938e9e8cab4b945d SHA-256: 03312318129bfceb35c2863a0c377dcf6b1424be769b41cdacc7af1bbd4ea3f4

474 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The PDF contains a critical PDF_LAUNCH heuristic firing indicating that cmd.exe is launched with parameters to create and execute a VBScript dropper. This dropper is designed to download a second-stage payload from an external URI. The embedded script and heuristics strongly suggest exploitation of CVE-2010-1240 to achieve initial execution and download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9147

Heuristics 11

Adobe Reader Launch action VBS dropper command chain critical CVE likely CVE_2010_1240_LAUNCH_VBS_DROPPER

PDF uses a CVE-2010-1240-style Launch action: cmd.exe is invoked from /Launch and builds a VBS stage that uses ADODB.Stream, MSXML2.XMLHTTP, or FileSystemObject to write or execute a 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
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/c echo Dim BinaryStream > vbs1.vbs && echo Set BinaryStream = CreateObject("ADODB.Stream"' — references a known-dangerous executable (cmd, PowerShell, etc.).
ClamAV: Win.Trojan.Dropper-134 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-134
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.
Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
PDF JavaScript WScript downloader high PDF_JS_WSCRIPT_DOWNLOADER

Decoded PDF JavaScript reconstructs a Windows Script Host COM downloader using WScript.CreateObject plus XMLHTTP/ADODB.Stream style download, write, and run behavior. This is commodity payload delivery rather than a specific PDF parser CVE trigger.
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.
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.foo.be/
- http://www.gitorious.org/~adulau

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_0000ddf7.bin` `b15dc73ab67ca77009404ad49278fc02b1b0edbcfee259ea6c2a13315a9dbe22`	pdf-embedded-script	PDF decompressed stream script payload at offset 0xDDF7	84436 bytes
Detection ClamAV: Win.Trojan.Dropper-134 Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s).
`font_00_cff_off00003d8a.bin` `09e18e495b68106a55aace3f441183e73b28de0f6fbcb0af0b76d08e38de00da`	pdf-font-stream	PDF embedded font (cff) at offset 0x3D8A	15636 bytes
`font_01_sfnt_off00007386.bin` `1bbf8d898c7de34b2ed1bfb68d2725a06e3c5e09957aee601794b4fe88adb9f4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7386	13054 bytes
`font_02_cff_off00009b0d.bin` `81cd2ec160f0dbbfecf3a7282aa50fb69c8be6a3e42aa5a6d27c573cc7517a2e`	pdf-font-stream	PDF embedded font (cff) at offset 0x9B0D	7529 bytes
`font_03_cff_off0000b8d9.bin` `19f70b70255abac1a93513d95c8ae661c9f9d2f99400a22c24727869e919e5ad`	pdf-font-stream	PDF embedded font (cff) at offset 0xB8D9	7369 bytes

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