PDF malware analysis — malicious · de4b8f38f72d510f

MALICIOUS

PDF

3.5 KB Authoring application: hXr (via va)

MD5: f3dfb4813979ad994783d66e16fe00b3 SHA-1: 71e27f52b7482c56128aafe9b7dfe99d1244a424 SHA-256: de4b8f38f72d510f74ec1ceb402584e56d7f67f6e5dee7787eab1e1975c3b7e0

278 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploiting Adobe Reader vulnerabilities. Critical heuristics indicate exploitation of CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through hex-decoded JavaScript. This script is responsible for decoding and executing further exploit code, likely leading to the download and execution of a secondary payload, as evidenced by the embedded file artifact.

Heuristics 8

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)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0004.bin` `60316167415fffed5a5e09fd9c219a721bab218f2859db880089c4d96a274c14`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xD9	11256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`xfa_hex_stage_000.js` `5bb8a6f46bf7c037ccd401fe1a530fd3caf89e1bd9d1ca5f5a84144d601d5ffe`	deobfuscated-js	XFA hex-decoded JavaScript (decompressed, direct) at offset 0x65E	4807 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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