PDF malware analysis — malicious · a3fad77a37e5c7da

MALICIOUS

PDF

37.0 KB

MD5: 62e6dcb09c972a8c8df7c76c9cadeaf7 SHA-1: 70ed8d1abc02075f63c490436e3a52daf502c9eb SHA-256: a3fad77a37e5c7da3ad30c92a8b9072bb22171360da57c5dd5b8c923a66eb5a8

224 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript T1190 Exploit Public-Facing Application

The PDF file contains embedded JavaScript that utilizes the 'unescape' and 'eval' functions, indicating obfuscation and dynamic code execution. The presence of a U3D stream and the 'CVE_2007_5659' heuristic firing, specifically mentioning 'Collab.collectEmailInfo', strongly suggests exploitation of a known Adobe Reader vulnerability. The script's purpose is to execute arbitrary code, likely to download and run a secondary payload.

Heuristics 8

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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)
Suspicious extracted artifact medium 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.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `9a3ffbbcb24ad1360b7f0e1c1041aabe62a3acab06ab8bd89a57d1289c44f5b3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	157 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` `17054dde7d7118e6793b99eee49b4685602e0f246431cd04e648cf31e247a6a1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x299	12867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `bc5c4a07116a33bbf620cc7daa876f9967cfccc4b419f6cf41b7cbde22112b79`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x299	5493 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `597e5a1091d23d33a61f1fcdf812caf4729f93ec4ec4302cdbfb82fb3c73416f`	deobfuscated-js	PDF JavaScript deobfuscation pass	202151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`u3d_00_off000027b1.bin` `70cf2aead4823e6d2651c9281eed0aa967449da358f439efb9e8e707421175e0`	pdf-3d-stream	PDF U3D 3D stream at offset 0x27B1	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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