PDF malware analysis — malicious · 8577696fa98ec207

MALICIOUS

PDF

8.5 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe

MD5: 1fb019359cb160de026f7cf70bc44842 SHA-1: ca4fc71f79c8565321123a35af43a934edf8ded2 SHA-256: 8577696fa98ec207b4bbbd996eaa89b6d1fc5cbd828af1019bf95738f44f314f

358 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams that leverage known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) through the use of eval() and specific PDF object functions. These exploits are designed to execute arbitrary code, likely to download and run a secondary payload. The presence of a polyglot child PDF and ClamAV detection of Js.Exploit.Shellcode-18 further support this assessment.

Heuristics 9

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)
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `eef59f5e72fee5b7bf928fea2a06a33b3e862666c09c939549d659d723877163`	pdf-javascript-stream	PDF /JS object 6 at offset 0xBFC	81 bytes
`javascript_obj0016_001.js` `1efd03d76cd48800ddedcf4d894ff3fd8c4e2695ca8255076528828c6d92fb60`	pdf-javascript-stream	PDF /JS object 16 at offset 0xC93	372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0026_002.js` `1fccefb7967a40dc54e359d29c139f824e6d10f5c88645db511b7f534c23267e`	pdf-javascript-stream	PDF /JS object 26 at offset 0xDDB	106 bytes
`stream_008_off00001dc7.js` `20b81aa2a1c6d664a73831502053192d9fba90f74adc46f1fdfec4dc31ffbf5e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1DC7	385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `341f97b9d1d264cdc216160a8f69b3f7eb42ef618943b84716080438a14e4951`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BB	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).
`javascript_obj0006_000_1.js` `f3c066ecff2b83f491651969e1c7655a23efd03367cfa1e445bbd77e12e10594`	pdf-javascript-stream	PDF /JS object 6 at offset 0xBFC	84 bytes
`javascript_obj0026_002_1.js` `5e2f0c6f021ca7552ae93a1119e88ad11d1315babfadaac191574f676a68e5f0`	pdf-javascript-stream	PDF /JS object 26 at offset 0xDE5	113 bytes
`polyglot_child_pdf_off000010f8.pdf` `25666b5cebb9e173dc0cd4c03fa6aa18931f07416daf4ed053cf60be7a0f4b42`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x10F8	4359 bytes

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