PDF malware analysis — malicious · c1bcb00db0cedbf2

MALICIOUS

PDF

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

MD5: 439592fceba3af85eb6de332aa4e256c SHA-1: cb8ee7e2bd5197fca905ce8e1e1206333627c1ef SHA-256: c1bcb00db0cedbf2b762a8e5d97c6454bb62f686c329fb7f69f66740362bb073

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell 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 uses eval() and unescape() functions, and the ClamAV scan on an extracted artifact detected 'Js.Exploit.Shellcode-18'. This suggests the primary function of the PDF is to exploit these vulnerabilities to download and execute a secondary payload.

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 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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `f042ff8440383c99ba679755e827fd51086331f35d45ac980f77f81480fa0f03`	pdf-javascript-stream	PDF /JS object 32 at offset 0x412	151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `1cec83c45a6a16676b0082c1bd391c01d32d04cc8803c72517d975a060019e58`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4C2	156 bytes
`javascript_obj0036_002.js` `61c81a980f247880cba097f083c87d2b05875bab1e608b1475fa58110f1edc67`	pdf-javascript-stream	PDF /JS object 36 at offset 0xEF	128 bytes
`javascript_obj0038_003.js` `814f95690c2f3108b3e9a764474e851f027c24f321e26906a532e25f8a0d52ef`	pdf-javascript-stream	PDF /JS object 38 at offset 0x12C2	163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `13a72694f12e87e76f0e9c6c37a0de5f3f40bd3dcde9239f20c8c11b2ffa3ee5`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	35 bytes
`legacy_pdfkit_stage_000.js` `e72a491b095612ee292b9e9dd3ac3db6c95bdc4ec5d8043dfd3cb305a54d64bf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5B0	6430 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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