PDF malware analysis — malicious · d7b8f16389579897

MALICIOUS

PDF

75.0 KB Created: 2009-11-21 19:48:71 Authoring application: PDF Library 8.3.5 (via PDF Library 2.6.6)

MD5: e35e2177feffdf0752877c9e0c9b405f SHA-1: a9287b0834490fe505cf2eb3ab2f0e84eb07f518 SHA-256: d7b8f16389579897eba649b356ff0c78b8d655fba0b1b81740d831ff098e9398

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of known Adobe Reader vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits are used to execute embedded JavaScript. An extracted JavaScript file, 'legacy_pdfkit_stage_000.js', was also detected as malicious by ClamAV, suggesting it is responsible for the second-stage payload. The attack pattern is consistent with exploit-kit delivery mechanisms targeting PDF reader vulnerabilities.

Heuristics 10

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-36110 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36110
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `366616f47180fe1a959bb2ad86615f1bb562be700b362e1a0b3751912284a7f7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	37909 bytes
`legacy_pdfkit_stage_000.js` `9ff23a0726cd83630a58e23ea4827a1a1c91bd6656719eb3211f897888f660e8`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	9802 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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