PDF malware analysis — malicious · c26eaff438081c14

MALICIOUS

PDF

5.7 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: 85800f98a187a46edb4cc6f0793b419d SHA-1: ec0de5733b26e75f5df0116ed5d60da54eacb70f SHA-256: c26eaff438081c14b30580f4bfc42bd5e43ee0ee6931ef6d86d79b8e1a4bb19a

398 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 CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659 through embedded JavaScript. The JavaScript streams, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', likely contain code to download and execute a secondary payload, as suggested by the ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted artifact. The overall detection as 'Pdf.Dropper.Agent-7217701-0' further supports this dropper functionality.

Heuristics 10

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: Pdf.Dropper.Agent-7217701-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7217701-0
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `dc407e9b7d4878ac85031b08054d0e30ba1cbcfaecb0db53e4c3d578e37c855f`	pdf-javascript-stream	PDF /JS object 32 at offset 0x3CE	165 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `c2ccf24b80dea4c9c13a95a9f1dba7161a20d4a7df4b2f984fc60e0499077a03`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4A9	113 bytes
`javascript_obj0036_002.js` `3dc23d376171193144215b94744050d64d884d49cf9ae3a9c6782f52bbc079a3`	pdf-javascript-stream	PDF /JS object 36 at offset 0xE9	119 bytes
`javascript_obj0038_003.js` `5f790f3a5ce9a1a80bc0211b1879ad6d4f50aa3d2ee05d1dc2d3568c3a317d70`	pdf-javascript-stream	PDF /JS object 38 at offset 0x13E3	145 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `349cdcd1bbf8a818d83e34455123377bc01bf43e3c25452385614416c00f35f8`	pdf-javascript-stream	PDF /JS object 78 at offset 0x73	34 bytes
`legacy_pdfkit_stage_000.js` `c5d1f6d95a587f8ca9e9ca5e13cae37c7d89544062b6ad7cf391f2a1f1c81adc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x586	6411 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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