PDF malware analysis — malicious · b1bcb07dc2b624be

MALICIOUS

PDF

13.5 KB

MD5: dcd097dce09440e0b5dc372efc4e6bc3 SHA-1: cdb02b8b53641c90574cbedbd05d38062cd0b502 SHA-256: b1bcb07dc2b624be4286e4be5ff53950e38e67348e4e1867ca1d299d5b3f4535

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains a critical heuristic firing for CVE-2007-5659, specifically exploiting the Collab.collectEmailInfo method. This exploit is used to launch a binary-XOR encoded JavaScript stager. The stager decodes and evaluates further JavaScript, which is designed to execute an Adobe Reader exploit. The ClamAV detection of Pdf.Dropper.Agent-7294199-0 further confirms its malicious nature as a dropper.

Heuristics 7

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.Dropper.Agent-7294199-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7294199-0
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0049_000.js` `ecd98ae94ba309988357edaa72faf1a5bda4aead69c948347abcf4622ca845d1`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	80104 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `ccb426d34e8b88ce9cc3b14a5949baae4ebbbbd1a83ff70935b9be102d49a4eb`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1342 bytes

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