PDF malware analysis — malicious · b03a5ffb074fbd23

MALICIOUS

PDF

1.95 MB

MD5: e75c3c894d2d43752941f9aa2b758653 SHA-1: f938a34c8fff0b9feb4936d747317675f451d346 SHA-256: b03a5ffb074fbd236af5e05152179072c9bd5f35534f255cf416014361946dd3

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains multiple critical heuristic firings indicating the exploitation of known PDF vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) through embedded JavaScript. An extracted artifact was also detected by ClamAV as Js.Exploit.Shellcode-18. The embedded JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload, as suggested by the 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_000_1.js' files. The presence of a secondary embedded PDF further supports a multi-stage attack.

Heuristics 8

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)
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `fde8bcde79a221dd81b2477b7f83c47a79dffee0aba7e1e4b5c237256d065c65`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2461 bytes
`legacy_pdfkit_stage_000.js` `ada8be7fcbbba2749cefe5122fc7e86dce72eb1b6eeddf6c5a324ca92ef02182`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xBB8	2546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0008_000_1.js` `f8d0303cc1fdd3c90be923e5cc24c33e1c6628c6935d3e83940a85d21ce25ab4`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2345 bytes
`legacy_pdfkit_stage_000_1.js` `a0fd2926642261c66decbcc680dd0e9c002562b628b08c6485d8dc29176f5673`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xB44	8430 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`polyglot_child_pdf_off0000a208.pdf` `5ec1d89c9307c647b5900e609908638cf290375b54fcbce84aa7715681836dfb`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xA208	2006520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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