PDF malware analysis — malicious · 85dbbc658a92e76c

MALICIOUS

PDF

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

MD5: f395ec57a45667fddd3bfa3f8ee09e2a SHA-1: 2ebff4dbaa5e434a986e8d188f09406b69df300c SHA-256: 85dbbc658a92e76c333b35d7d8ad13d83dab7172868a42a520cd27119b5e5d60

372 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1204.002 Malicious File

This PDF file contains a critical PDF_LAUNCH heuristic indicating an attempt to execute an external program. Specifically, it targets cmd.exe with parameters that suggest the creation and execution of a Visual Basic script. This script, likely embedded within the PDF, is designed to download and execute a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 9

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.
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` `6ddcc5674911d6e2dcc0f71e951a1941a67ea8c5b385ee74d8e05014701c9243`	pdf-embedded-script	PDF decompressed stream script payload at offset 0xDDF7	290216 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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