PDF malware analysis — malicious · 4f683d82babc883c

MALICIOUS

PDF

14.3 KB

MD5: b8462a8900a5afcd05aff6f6bbdc68c9 SHA-1: 7f9d29a78e7cd030519172131bf91434f1648c66 SHA-256: 4f683d82babc883c5030f41c955f04ba1f45313880ed57effe3315c26590f65e

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating the exploitation of known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) via embedded JavaScript. The embedded JavaScript, specifically the deobfuscated legacy_pdfkit_stage_000.js, is responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection of Js.Exploit.Shellcode-18 on an extracted artifact. The PDF's OpenAction trigger initiates this malicious chain of execution.

Heuristics 9

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)
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.
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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
`javascript_obj0019_000.js` `3da2b6c1454d97f140e82da5968c0d6d868ed2e92bc0c016e9fdfc313697a027`	pdf-javascript-stream	PDF /JS object 19 at offset 0x2D52	290 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `6e2498e3d1ceb81c3598b6939a6e6d3dda0152ffc64fc7e76b50349f00a8db64`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F12	5766 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.