PDF malware analysis — malicious · 7e9f40cba080dc73

MALICIOUS

PDF

3.91 MB

MD5: 8cca1877f5e51e81a846e08c53bfdf91 SHA-1: 7623f8374f05c91529e3d5ffa7507ae4aea193fb SHA-256: 7e9f40cba080dc73d59744c262c0019c3178cc43c9701bf535dea400f8971ffd

460 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.007 JavaScript

This PDF file is malicious, detected by ClamAV as Pdf.Trojan.Agent-36936. It contains embedded JavaScript that utilizes character-table indexing for obfuscation, a technique associated with exploiting several known PDF vulnerabilities including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992, and CVE-2023-26369. The script's purpose is to download and execute a second-stage payload. An external URI to http://www.technoton.by was also found.

Heuristics 13

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED

PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
ClamAV: Pdf.Trojan.Agent-36936 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Trojan.Agent-36936
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.
Character-table JavaScript eval stager high PDF_JS_CHAR_TABLE_EVAL_STAGER

PDF JavaScript reconstructs an exploit stage by indexing into a small character table, appending hundreds of one-character fragments, joining the array, and evaluating the result. This static fallback fires only after the bounded decoder recovers an exploit-like stage, so it catches this obfuscation even when no single CVE API signature is available.
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.
External URI info PDF_URI

PDF contains an external URL action
Suspicious extracted artifact info 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.
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.technoton.by

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `9e3ee3f7cd9576f0e400eaef9b991dd0eae2c9cc47c9c303c22095d4c939c5c7`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2C2	97289 bytes
Detection ClamAV: Js.Exploit.HTML-29 Obfuscation or payload: unlikely
`stream_002_off0001ac19.bin` `108cb3464a7b3484dc10ce9737cd8bbc993bdf0c3146df0b3aa9af3bad77e39c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1AC19	28168 bytes
`stream_079_off000fe25a.bin` `37e246767cf8ad8b04995b30b829cb9f02e3d478b6de19edfc959b11c15271a7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xFE25A	89171 bytes
`char_table_stage_000.js` `b2ba5e38aa751924873bf472fd53b768fd082f58d065ff842d7dc02e77dc26aa`	deobfuscated-js	char-table indexed JavaScript (PDF /JS object 76) at offset 0x2FB	3900 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`font_00_sfnt_off00022db8.bin` `87ced94377c0c83564c61be5eeaf9f12a9bb260265f3e0742f818d0fd4829a02`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22DB8	5884 bytes
`font_01_sfnt_off0004e49c.bin` `9d4d160cd16de36ac3fc14524e26bf1a188a98e43cb86729b14012a83def52d5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E49C	20048 bytes
`font_02_sfnt_off00051ffd.bin` `f887039ead88a76a85d8f2fbe77284d31b2086bb414ca684df349dd0dc05bc2e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x51FFD	13388 bytes
`font_03_sfnt_off00054dc9.bin` `3c7bf5a54b8adf3a976d4ce3cd251ab5fa18c106f3accde770f5c500b11c190d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x54DC9	19420 bytes
`font_04_sfnt_off00059752.bin` `60a1e2969a4f850a8797d1d88c08d2b011fe813470242e5aef06f1a7cdf94f6f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x59752	16836 bytes
`font_05_type1_off00074bc8.bin` `c6f62103d8c9ddbc8568027836db5d28fc5839ebe03cdaa9617047bd10b4034a`	pdf-font-stream	PDF embedded font (type1) at offset 0x74BC8	11546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.

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