PDF malware analysis — malicious · e964f67d13e8dd69

MALICIOUS

PDF

75.3 KB Created: 2009-11-10 19:44:65 Authoring application: PDF Library 1.8.6 (via PDF Library 10.5.6)

MD5: 3b5ce338151e85d15ec2b4e4310bee18 SHA-1: 3f84a9b297a24244681b2295b8b923306c4ed741 SHA-256: e964f67d13e8dd69b547a31ca6f4ae73b2f241e4e36325bab2d97d853bc09a3b

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object

The PDF exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, indicated by the use of specific JavaScript API sinks like Collab.getIcon, Collab.collectEmailInfo, and util.printf. Static analysis recovered deobfuscated JavaScript from an embedded artifact, identified as legacy_pdfkit_stage_000.js, which likely downloads and executes a second-stage payload. The ClamAV signature Js.Exploit.Shellcode-18 further confirms the malicious nature of an extracted artifact.

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 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` `0dc3e9b59599adce326768a1e063f452f3a08fe84cf53d3df3fbfd782ec33504`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38043 bytes
`legacy_pdfkit_stage_000.js` `09546f441419d7f1d5a527a02927a1f51c29931503e6bf5dcadf98af53dcff53`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	9868 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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