PDF malware analysis — malicious · 28842b37b5c622ab

MALICIOUS

PDF

9.7 KB

MD5: b11f2f9cccbd8fcb44819aff774a4d56 SHA-1: 567a5044cc0157a76d647aeadbb253a521991217 SHA-256: 28842b37b5c622abd036ea5b61434b9eaa465ffa6d879518757922c83845fdec

244 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript that utilizes the `Collab.collectEmailInfo` method, indicative of the CVE-2007-5659 exploit. The JavaScript is heavily obfuscated using `eval()` and `unescape()` calls, and further processed through hex decoding, making its exact function difficult to ascertain without dynamic analysis. However, the presence of these exploit primitives strongly suggests the script's purpose is to download and execute a secondary malicious payload. The ClamAV detection of 'Pdf.Exploit.Agent-3083' reinforces the malicious nature of the file.

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)
ClamAV: Pdf.Exploit.Agent-3083 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-3083
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 4

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 0x196	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` `330eeb3fd1d3b02d82ebacc345deff920a3479360d86c74c409a8424014958fa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x293	12487 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` `67fca35a6e5d4fd125c2f770d6cdbda8d978b05723ce0ba7f21d7252ad54c67b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x293	5322 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`deobfuscated.js` `e6410010349798f06aa5cdd3a807aa917901ff75672cfe0729eb4ef1b142fde0`	deobfuscated-js	PDF JavaScript deobfuscation pass	69636 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).

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