PDF malware analysis — malicious · 31f18d7af3dd31be

MALICIOUS

PDF

77.5 KB Created: 2009-12-04 19:41:59 Authoring application: PDF Library 10.6.8 (via PDF Library 7.2.1)

MD5: d4bd2e293f1349dd66c4bb174ea2f41f SHA-1: 5d1ced55c4409f6e4d0c6eb248bf381d47aa2e41 SHA-256: 31f18d7af3dd31be1d4dc1bc75214ed8abe6cb367b59764d61c4b2ff06d5aa72

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document is malicious, exploiting multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. Static analysis detected embedded JavaScript streams and identified a deobfuscated JavaScript file, 'legacy_pdfkit_stage_000.js', which likely contains the exploit code. ClamAV detections further confirm its malicious nature, flagging it as 'Pdf.Exploit.Agent-8675' and an extracted artifact as 'Js.Exploit.Shellcode-18'. The exploit likely aims to download and execute a second-stage payload.

Heuristics 9

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)
ClamAV: Pdf.Exploit.Agent-8675 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-8675
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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `58c82c8dae7c0719dd0cf63e6e7946246bc76ef15920e3c5057d340130177be2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	39196 bytes
`legacy_pdfkit_stage_000.js` `92239c2a31149d1608385e0b20eef401ff2ffcd2ae8416404e2dc3f70ef35983`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10108 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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