PDF malware analysis — malicious · f6c7b23541caf9a1

MALICIOUS

PDF

5.8 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: f393c0065fae920a384caa5d3ebd8d69 SHA-1: 437075dc21b50b12486eab60a82495db89a707ba SHA-256: f6c7b23541caf9a1ef65cc01df3df86852dbcc9d23a4909cafdfd8abbbb1d95e

298 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file that leverages two critical CVE exploits (CVE-2009-0927 and CVE-2007-5659) to execute embedded JavaScript. The JavaScript, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated but contains eval() calls, indicating dynamic code execution. ClamAV detections further confirm its malicious nature, flagging it as 'Pdf.Exploit.Agent-35931' and an extracted artifact as 'Js.Exploit.Shellcode-18'. The primary intent appears to be the execution of a malicious script, likely a downloader for further stages.

Heuristics 8

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.Exploit.Agent-35931 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35931
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `82186e99f769334cbeec222616733a4bc40fbe62367e31a693cd0e6cd7bb1d84`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1338	897 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` `eda385332aa05a06533975701d91cd864d44cc3a8c61a7acf6ecd8d347844aa9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x16E	4859 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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