PDF malware analysis — malicious · 23dba8cea4af8cfc

MALICIOUS

PDF

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

MD5: 993d361db4ca4cfbfedd15b95ea957fa SHA-1: b9786651d490ccf50d1351aa51254e76f464ae7e SHA-256: 23dba8cea4af8cfc53609bf1881d27b2aeba871650d9b9b9cc22a843474e56f9

398 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

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 indicated by the ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted artifact. The ClamAV detection of 'Pdf.Dropper.Agent-7239618-0' further supports its role as a dropper.

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-7239618-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7239618-0
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` `63a0a55adfad31ac1c091ec58dcb3de8bc1d00d752ddb402a83e9b7dcd880f76`	pdf-javascript-stream	PDF /JS object 32 at offset 0x43D	177 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `dfe11d4e8b837fc687c47a15c6c94be45eb3c4fda2a145e8da0c2d155afb7c5f`	pdf-javascript-stream	PDF /JS object 34 at offset 0x526	130 bytes
`javascript_obj0036_002.js` `35f99957f0771017d5918b28197ae0fff5b1187d1aa6389d971504a6ca76c405`	pdf-javascript-stream	PDF /JS object 36 at offset 0x101	129 bytes
`javascript_obj0038_003.js` `1a959e865a984aa06f29d932493e5243283d9e9525220ec8ea3cf85117f6de9f`	pdf-javascript-stream	PDF /JS object 38 at offset 0x1464	156 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `6a3a23edeef4ad6b736a37d3886b31d2e0045298c9307b873c44f98c57fc73ad`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	39 bytes
`legacy_pdfkit_stage_000.js` `ffafb4c43c238e0259ca2c97bd33439c6ccf2469599d9f85d456a7f53ce506e5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x616	6382 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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