PDF malware analysis — malicious · b7aa7f96f3d041fa

MALICIOUS

PDF

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

MD5: 08639a4e7361d617a4ce98b650a37c9a SHA-1: d0b5603c788ad360e17959aede04fa8021afd737 SHA-256: b7aa7f96f3d041fac632a1d9a7eb0a9968b04f1d6020ba7cfd699dca46c39e8d

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating the exploitation of known PDF vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) through embedded JavaScript. The JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', were found to contain obfuscated code and an 'eval()' call, suggesting it attempts to download and execute a secondary payload. ClamAV also detected 'Js.Exploit.Shellcode-18' in an extracted artifact, further supporting the malicious nature.

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)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `38d4316050cacbc5bca23c562b8bca63e31810ff02ef742b69d77d8964564ef3`	pdf-javascript-stream	PDF /JS object 6 at offset 0xC59	53 bytes
`javascript_obj0016_001.js` `ee68974f3387994c29e06caa62bdbcde49ffce774c4a42799a40345069405e61`	pdf-javascript-stream	PDF /JS object 16 at offset 0xCD8	126 bytes
`javascript_obj0026_002.js` `4088cdc5ffa6dc2c9c53420d50d1692fb9c62d19d59bf0fcf080d9efdc3fa4ac`	pdf-javascript-stream	PDF /JS object 26 at offset 0xD97	42 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `a58d01f67e7dd1130bf3d29c275fa16ccc1dc90da27e33bce6f50626766bdf5e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x205	6435 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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