PDF malware analysis — malicious · 37c18931a262fcdf

MALICIOUS

PDF

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

MD5: 66428b775574635eeeaff37f473ca23a SHA-1: 567be988aa5db563c2f671a1fa26a2824947bd85 SHA-256: 37c18931a262fcdf78b198e91b4271a4c43b7e8ea3ccedc7500d60bcffb1cf7a

398 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

Multiple critical heuristics indicate exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659 via embedded JavaScript. The ClamAV detection 'Pdf.Dropper.Agent-7249440-0' and the detection on an extracted artifact 'Js.Exploit.Shellcode-18' further support this. The JavaScript likely downloads and executes a second-stage payload, consistent with a dropper's behavior.

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-7249440-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7249440-0
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` `ab7ddb0285bb23ffa05f3e52d52e138775905a2cb6787c9879eb2f4c51f09040`	pdf-javascript-stream	PDF /JS object 32 at offset 0x435	171 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `56cd3396cfb9f529fc0c96e7d5974e04d6de6673edb36ff03affd1cda261a41e`	pdf-javascript-stream	PDF /JS object 34 at offset 0x518	124 bytes
`javascript_obj0036_002.js` `b1dcbed4fdd438d0a2876bf7833cc493065b33a570b86e1c5c79986b47d0a953`	pdf-javascript-stream	PDF /JS object 36 at offset 0xFD	123 bytes
`javascript_obj0038_003.js` `08f81264ae732610390e9fe2416344c55acc5faa2e37d4b11e0c040b4ac2c3df`	pdf-javascript-stream	PDF /JS object 38 at offset 0x145B	146 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `86d1780bf9c6b2f200cf68daa504de0db134cf7c92079d230b8ade1b3e9e994e`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	35 bytes
`legacy_pdfkit_stage_000.js` `c9fc5c5d8cfe6f7ffaf58aaf7ded1eead15ae45c8066aacb92fe4d4b4570aeeb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x605	6406 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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