PDF malware analysis — malicious · af4cc63e97851180

MALICIOUS

PDF

37.0 KB

MD5: 7af8ed982cba33a444bbbd9eb503ba80 SHA-1: 4b15d5cac8037fb6962d460531edced5805a6313 SHA-256: af4cc63e97851180726ecc2e157a072f33c1550d5b8a63879281b3091162b0a1

224 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious PDF T1059.001 Command and Scripting Interpreter: JavaScript T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566.002 Phishing: Spearphishing Attachment

The PDF sample contains multiple indicators of malicious JavaScript execution, including `eval()` and `unescape()` calls, and specifically triggers the CVE-2007-5659 heuristic related to `collab.collectEmailInfo`. The embedded JavaScript, particularly in the `deobfuscated.js` file, is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of U3D content also points to exploitation of Adobe Reader's 3D parsing capabilities.

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` `9ac39953c05a4a56196e2e60e87dfd2957ad08091b0b0cb062a1f2bd0f43dc1d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x299	13005 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` `53fa041c9c722548de8237867bcd9e414795d4f26a5ef2eda64bd0d2d9e2d3aa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x299	5592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `bdacbac2e67ba46376433dac4a68a8ddb870c053275b95479b84f5d3efe084ac`	deobfuscated-js	PDF JavaScript deobfuscation pass	269588 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_off000027ca.bin` `70cf2aead4823e6d2651c9281eed0aa967449da358f439efb9e8e707421175e0`	pdf-3d-stream	PDF U3D 3D stream at offset 0x27CA	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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